Earth Science

Earth Science covers all facets of how the earth works, from from volcanoes to the world's oceans.

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How much does planet Earth weigh?

The Earth is incredibly heavy. How do scientists determine the weight of the Earth?

Waterfall Pictures

Huge walls of cascading water never cease to capture our attention with their majesty. Ready to marvel at nature? Check out some of the most beautiful waterfalls in the world.

How did Lake Nyos suddenly kill 1,700 people?

One evening, people heard their local lake rumbling. A day and a half later, 1,700 people were dead. What happened on that fateful night?

What are the four fundamental forces of nature?

What are they? We'll give you a hint -- or four. Earth, wind, water and fire aren't among them, but our old friend and force gravity is.

How the Terracotta Army Works

Emperor Qin ordered 7,000 generals, cavalrymen and archers to protect his mausoleum. What's so odd about that? Well, they were made of terracotta.

What is wastewater agriculture?

Though it may seem disgusting to some, people all over the world must use waste water to irrigate their crops. Can you get sick from wastewater irrigation?

Are sand dunes really alive?

Sand dunes belch, moan and hum. They roll across the desert, seeking out new locales. You might even say they breed. It's no wonder people call these giant sand formations lifelike.

How Sand Dunes Work

Did you know that sand dunes can sing? And, their artistic curves certainly make for a gorgeous photograph. In fact, you might call the sand dune the diva of the desert.

Were dinosaurs the most successful animals on Earth?

When some people hear the word "dinosaur," they immediately think of outdated technology. Does that mean that the dinosaurs themselves were failures?

Is the Dead Sea really dead?

The Dead Sea is host to tourists who visit in droves to soak in its mineral-rich waters. Is the saltiest body of water in the world about to dry up?

What if the Chicxulub meteor Had Missed the Earth?

Many scientists believe that the impact from a massive asteroid was what killed off the dinosaurs. It's what started the Age of Mammals. But what if the asteroid had missed?

How are fossil replicas made?

Sometimes dinosaur fossils are too large and heavy to display without damaging them. How are those enormous models built? And what makes them look so realistic?

What's so special about a dinosaur named Leonardo?

Ever since its discovery in 2000, a dinosaur fossil named Leonardo has held the interest of paleontologists the world over. A 3-D model of the animal even toured the world. So what's the big deal?

Could Dinosaurs Swim?

Scientists believe that water pressure kept many dinosaurs from swimming. But does that mean that none of these massive animals took a prehistoric skinny-dip?

Did dinosaurs have feathers?

Some people believe that dinosaurs were relatives of today's birds. But, you might ask, if that's so, why didn't they have feathers? Funny you should ask.

How did dinosaurs leave tracks in solid stone?

It's not a trick; before you are a number of reptilian footprints in the rock. They're dinosaur tracks, preserved for thousands of years. But how did they possibly get there?

Who owns the oceans?

Early explorers drove flags into the ground to claim territories. But no one bothered to float a flag in the oceans. For the most part, we peaceably shared the oceans until we realized what valuable goods could be found in their dark and murky depths.

How did scientists find soft tissue in dinosaur fossils?

Everyone knows that once a bone has fossilized, it's hard as a rock, right? So how did scientists find soft tissue inside a broken dinosaur bone?

How do scientists know what's inside dinosaur eggs?

Dinosaur eggs and the embryos inside can teach us a lot about dinosaur reproduction and behavior. But how do scientists get the rocky embryos out from the equally rocky shells?

How can you make water invisible?

It's colorless, odorless and definitely life-sustaining, but is it invisible to the naked eye? Not usually. So what's going on with everyone's favorite liquid?

Was Tyrannosaurus rex a predator or a scavenger?

Hollywood makes T. rex seem fast and agile, but some scientists think it was a scavenger, like a vulture. So which was it?

How Wave Energy Works

Rough times call for creative measures. The world is filled with oceans, and oceans are filled with wave energy that could potentially be transformed into power. Is wave energy a viable fossil fuel alternative?

How Hydrology Works

Without water, Earth would be a barren and lifeless planet. But did you know the Earth's water supply has not increased or decreased for billions of years? No wonder hydrologists are so fascinated by water.

Ocean Conservation Pictures

Ocean conservation has been a popular topic in many environmental debates recently. This collection of pictures show just why ocean conservation is so important.

Which of today's animals lived alongside dinosaurs?

We all know the cartoons of prehistoric people running from dinosaurs aren't realistic. But many animals living today have ancestors from that time.