A primer on reading the rock layers of roadcuts

Learn about how highways are designed and the geometry behind what makes them safe and efficient.

Explore landforms that exist across America's national parks

Landforms are not just scenic vistas; they are geological storytellers that shape ecosystems, climates, and our understanding of Earth's history. In this comprehensive look at landforms from the National Park Service, you will learn not only about different types of American landforms, but you will understand how these geological features are shaped by various forces, how they reveal an area's geological history, and how they influence climate and ecology.

Paleontologists apply rules about rock layering, fossilization, and radioactivity to date geological samples

Concepts such as the understanding that older rock layers will form beneath newer ones allow scientists to compare the ages of samples from various layers. Although no geological site preserves evidence across all time, samples can be combined with fossils of known age, such as those dated by analyzing the decay of their radioactive isotopes, to reconstruct Earth's timeline.

A guide to crude oil and natural gas extraction, from rig site preparation to land restoration

Requirements for traffic plans, access roads, and noise barriers vary by state and local laws, but once the rig site is prepared, the rig is assembled and digs a well that is then encased in steel and cement to protect groundwater reservoirs. After drilling and testing the extraction pipe, fracking fluid is injected into the rock to create cracks where crude oil resides, allowing it to be pumped out.

A case study of how engineers and geologists at Tullow Oil look for oil reserves

An analysis of surface rocks using aerial and satellite imagery can help narrow the search for crude oil by identifying basins where sedimentary layers have compacted—a key process in oil formation. Surveys that look for variations in Earth's gravitational and magnetic fields consistent with specific rock distributions, or that use sound waves reflected off rock layers—not unlike sonar underwater—can also help map subsurface geology.

An immersive curation of the world's rock art

A living archive of humanity’s ancient art and symbols, our shared history that is embedded as rock art and cave art in the landscape

Fascinating 3D animation shows how Romans built roads

Highly efficient engineering and materials production allowed Roman administrators to lay down nearly 50,000 miles of roads across the ancient empire. These roads were built so effectively that many are still around today. Watch this quick 3-minute video to see how they did it.

Niagara Falls flows over 400-million-year-old layered rock

The falls cut through distinct layers of ancient rock: a hard cap of Lockport Dolomite sits atop softer layers of Rochester and Queenston Shale. This structure allows the falls to maintain a steep vertical drop as erosion undercuts the caprock.

At the 100th birthday of Route 66, a look at what makes it distinctive

The iconic road from Chicago to Santa Monica was first laid out by Cyrus Avery, a member of the highway board, in the 1920s. Before the interstate system was created in the 1950s (rendering the route a tourist route), Route 66 became the site of major roadside attractions, food stops, and lore as early American drivers explored the countryside by highway. This visual-rich essay showcases its origins and how the route stands today.

Magnetic material in rocks provides evidence of flips in Earth's magnetic field

Volcanic rocks can lock in the direction of Earth's magnetic field as they cool, making them natural recorders of magnetism. Dating rocks and seeing the changing orientation of their magnetic field helps construct a timeline of Earth's magnetic field history.

From the Greek words meaning 'rock blanket,' regolith is any layer of material covering solid rock, including soil, rock fragments, and dust.

The 52-mile marvel of engineering inside Glacier National Park

Glacier National Park is home to over one million acres of natural beauty, but it also includes 52 miles of a manmade miracle in Going-to-the-Sun Road, which takes drivers on a majestic tour through some of the park's most breathtaking views. This brief history and photo gallery allows you to gain an appreciation for the incredible engineering behind the road’s construction.

How do archaeologists know where to dig?

Archaeologists spend their days slowly uncovering buried artifacts, but how do they know where to look in the first place? New tech and old-fashioned shoe leather. Watch this five-minute video to learn more.

See top-down views of Washington state's geology with cutting-edge lidar

Lidar is a revolutionary tool that creates visual models of landscapes using rapid light pulse measurements. Geologists in Washington state have deployed the technology to study the state's fault lines, landslides, tsunami inundation zones, and much more.

Predicting earthquakes is difficult because different rock types can withstand different amounts of stress before breaking and melt at different temperatures within Earth's interior, introducing uncertainty into predictive models.

A simple pictorial explanation of ocean geography

Visualizing ocean geographical features, such as a coastal zone, continental shelf and abyssal plain. This article from the US Geological Survey also provides several links to diverse ocean facts.

Check out the 50 weirdest roadside attractions in the US, from Alabama's Unclaimed Baggae Center to Wyoming's Elkhorn Arch.

Every type of US national park, explained

Ever wonder what kinds of sites comprise the US National Park System? Using the recent re-designation of New River Gorge as a national park as a jumping-off point, this engaging video breaks down the 19 different designations within the National Park System. This includes parks, reserves, monuments, and scenic trails.

While constructing the tunnel connecting the UK and France, satellite positioning systems were supplemented by paleontologists on either side of the tunnel, who analyzed fossils to ensure excavation was at the correct depth.

Flip through centuries-old artifacts in this 3D library

Archaeology is hands-on work, giving researchers the ability to analyze artifacts from as many sides as possible to find marks left by those that came before us. While looking at pictures of artifacts gives you some insight, you're limited to...

How the US built the Interstate Highway system

As late as World War II, it took a well-prepared motorist roughly 10 days to cross America from coast to coast in a car. That all changed when the nation undertook its biggest public infrastructure project in 1956, the National Interstate and Defense Highways Act, initiating a 36-year, $114B mission to lay 41,000 miles of roads across America. Watch a smart overview here.

The slow disappearance of America's roadside attractions

Roadside attractions, as defined by Jane Stern, are quirky, oddball landmarks. Instead of corporate entertainment, charms like a giant twine ball, a shabby dinosaur sculpture exhibit, or hand-painted oddities beckon travelers off the interstate. These roadside attractions have declined in recent years, but Stern commemorates their value and reflects on the joy of discovering unusual and homemade wonders in this piece.

Explore the system of ancient Roman roads with this interactive

The Itiner-e map includes unpaved secondary roads that connected farms and towns to the empire's primary routes. Explore routes, view three-dimensional elevation, and compare the old roads to contemporary ones with this sprawling interactive project.

View examples of rift valleys, the product of surface divergent boundaries

At these boundaries, tectonic plates move apart, stretching and thinning Earth’s crust as long valleys are formed from smaller, interconnected valleys and troughs. Ongoing rifting and erosion can further sink the valley, becoming a rift lake if volcanic activity becomes inactive.

Why are ancient ruins underground?

When cities fall into disrepair, it's often easier to flatten what you can and build on top. This is why modern archaeologists frequently discover ruins underground, revealing generational layers of cities rebuilt over time. This video explores major examples of this principle, from ancient Troy to even modern Seattle.

Earth's inner structure is a dynamic system of layers in constant, slow motion

From the crust to the core, each of Earth's layers—some solid, some liquid—plays a role in generating its magnetic field, moving tectonic plates, and cycling matter. These details are determined through modeling since humans have only drilled 12 kilometers underground.

How NASA plans to build a lunar base, from roads to habitats

The Apollo program aspires to return humans to the moon—and to build humanity's first permanent habitat on its surface. The project involves complex construction plans, including creating roads from moon dust, baking bricks to build habitats, and more.

How underground radio revitalized rock 'n' roll

Early FM was a wasteland and quickly became the domain of amateurs and risk-takers, including many stations and DJs who played music that flew in the face of mainstream trends. This history of the band's scrappy beginnings unpacks how it realigned the rock charts.

Watch animations of the creation and excavation of dinosaur tracks

The discovery of a dinosaur trackway in the UK emerged from a controlled explosion that removed limestone from an Oxfordshire quarry. The footprints provide unique insights into dinosaur behavior and movement, with marine fossils suggesting a lagoon-like environment.

Roman roads have lasted for millennia and were key to its military might

Known for their almost absurd straightness, Roman roads connected the empire's armies, messengers, and traders as imperial administrators sought to keep down rebellion and build up Roman wealth. Rome's highways were expertly engineered, well-patrolled, and easy to navigate.

After a landslide, repeat activity may follow the appearance of cracks, springs of water, or dirt, sand, and rocks tumbling down from scars—exposed portions of Earth where the initial landslide began.

Explore an interactive atlas of worldwide critical mineral production

This tool from the US Geological Survey tracks the production over over 90 minerals in 180 countries. For a selected country, you can see how many critical minerals it produces, where else those minerals are produced, and what each mineral is used for.

The internet explained at five levels of difficulty, from protocols to internet flattening

Resembling a roadway with traffic laws that all cars must follow, the internet is the hardware that connects a source to a destination, and these connections must follow specific software rules. Although data had to travel through about 10 networks to reach a destination in the past, data centers increasingly consolidate traffic, just as a highway does for cars, to improve data speeds.

Stonehenge was built using giant wooden rollers and precisely carved tongue-and-groove joints to lock the stones in place.

This short animation shows how human beings managed to lug 30-ton stones over miles of prehistoric English countryside and stand them up The Stone Age engineering involved using giant wooden rollers and carving precisely interlocking tongue-and-groove joints to hold the heavy stones in place.

Cooling lava naturally creates hexagonal cracks to evenly relieve stress

When lava cools and turns into rock, it contracts and builds up tension, particularly when held in place by the surrounding landscape. Just as drying mud cracks, initial cracks in the rock are random, but quickly organize into a hexagonal pattern, which scientists consider the most space-efficient shape.

The San Andreas Fault is an example of tectonic plates sliding past each other

The transform boundary divides the opposing movements of the Pacific and North American tectonic plates, which create shear zones that distort and fracture rock. These movements produce shallow earthquakes as rocks are gradually displaced hundreds of miles.

Explore a collection of moon interactives from NASA, including a 3D lunar surface explorer, a tool for classifying moon rocks, and an interactive map for observing the moon each day of the year.

Explore an interactive timeline of rock 'n' roll's origins in blues, swing, country, and other genres.

While landslides are associated with the downward flow of unstable terrain, the term encompasses a variety of geological processes, which are distinguished by how the material moves and what materials are involved.

Lidar's discoveries: 32 forts revealed by the laser tech

Lidar is a cutting-edge tool using lasers from an aircraft to map the elevations of huge swaths of land across the world. This technology has been especially effective in archaeology. It has revealed dozens of lost major historical sites concealed beneath overgrown brush and forests. From Canadian forts to Mayan settlements, check out these 32 significant finds from lidar.

Fossils form in environments where dead organisms can be rapidly buried

Such landscapes enable corpses to be encased by terrain before significant decay occurs. They are most commonly found in river deltas and sinking coastal regions, where sediments accumulate over time until geological forces expose the areas to erosion, revealing embedded fossils.

One writer traces the evolution of a Billboard chart over 25 years

Billboard introduced its Modern Rock Tracks chart in 1988, looking to capture the rising popularity of acts like the Cure, REM, and U2. Music writer and Billboard obsessive Chris Molanphy traces the chart from his earliest days through grunge, alternative, and corporate eras, demonstrating just how much taste changes over time.

Modern landfills use layered liners, leachate systems, and gas monitors to safely contain waste

Today, landfill engineering is far more complex than a hole in the ground, which was largely the system cities used less than a century ago. This video explains how it actually works.

View a list of 50 minerals critical to US economic and national security

Most of the US's supply of critical minerals depends on countries that have historically competed with it, which has raised concerns in Washington. These minerals are needed for green technologies to meet greenhouse gas emission reduction goals.

Why is there an archaeologist in my trash can?

Archaeologists have always been interested in rubbish—sites such as waste heaps, middens, and latrines can be some of the richest places to learn about the human past. But the type of rubbish we're leaving behind is changing, and much of it now...

Mid-ocean ridges are underwater volcano systems where tectonic plates diverge

New ocean crust is formed at these ridges as magma rises from Earth’s mantle and fills the space between the spreading plates. The speed of divergence influences ridge shape, with slow spreads forming rugged valleys and fast spreading creating smooth, wide slopes.

Learn how the Earth was made

Four and a half billion years ago the Earth formed from dust in space to become a molten ball of rock orbiting the sun. Travel back in time to investigate how the Earth was made.

Cosmogenic nuclide dating reveals how long a surface has been exposed to air by measuring the abundance of rare isotopes produced when cosmic rays interact with minerals.

What can we learn from archaeology?

By revealing buried civilizations and dating objects of antiquity, archaeology turns hard data into human stories. But what's the use of knowing these stories? Find out for yourself in this interactive resource that can take you to and through historic sites around the globe.

The booming fossil industry on the Jurassic Coast

Ever since the Jurassic Coast was registered as a UNESCO World Heritage site in 2001, professional and amateur fossil-finders have increasingly set out for its craggly cliffs to discover ammonites, icthyosaurs, and even new discoveries. This photo essay takes a human look at the growing interest and industry in fossil discoveries along the famed 95-mile strip of England.