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rocks

Rocks
Image: iStockphoto.com/redmal

Rocks

Rocks abound, providing the very ground we stand on, but they are always on the move. They also show great variety, although only three types start out.

Skip through millions of years, create some forces, and zoom in to see how rocks form and change.

BBC
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Birth of the Oceans: Earth’s First Rocks

Birth of the Oceans: Earth’s First Rocks

In 2002 this researcher discovered the oldest mineral sample ever found on Earth — a zircon crystal 4.38 billion years old. Find out what it reveals about our planet's history. More...

Video
National Geographic
Watch Death Valley’s Rocks Walk Before Your Eyes

Watch Death Valley’s Rocks Walk Before Your Eyes

It's a mystery scientists had been trying to solve since 1948: How do "sliding rocks" or "sailing stones" up to 600 pounds slither across Death Valley's dried mud? Find out how they finally solved it. More...

Video
National Geographic
Rocks and Minerals

Rocks and Minerals

What's the difference between a rock and a mineral? How are minerals identified? And why should you care about any of these earthly elements? You'll find out here. More...

Article
GRe Net
Death Valley’s Moving Rocks

Death Valley’s Moving Rocks

Nearly 200 rocks slowly creep across Death Valley in California, some reaching speeds of 4 mph. Geologist Paula Messina has been studying this phenomenon for 16 years. Find out what she's learned. More...

Video
National Geographic
Dynamic Earth: Introduction to Rocks and Minerals

Dynamic Earth: Introduction to Rocks and Minerals

Take a closer look at the building blocks of our planet to discover how Earth is always "recycling and transforming its rocky crust." More...

Article
Melbourne Museum
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Eggshell Geode Crystals

Eggshell Geode Crystals

Crack open some eggs to discover how geodes are formed in igneous and sedimentary rock. More...

Activity
Science Bob
Introduction to Rocks and Minerals

Introduction to Rocks and Minerals

Rocks make up the surface of the Earth, but what are rocks made of? See how different combinations of minerals give rocks their specific physical characteristics. More...

Video
TMW Media
Minerals Close-Up

Minerals Close-Up

From this small pile of rocks come some very common minerals. Take an up-close and careful look at them to discover more about their rocky origins. More...

Images
U.S. Geological Survey
PacSci-Doku: Rocks on the Move

PacSci-Doku: Rocks on the Move

Use the available letters to solve this Sudoku-like puzzle and answer the question, "What mysterious geologic feature is produced by rocks in Death Valley?" More...

Game
Pacific Science Center
Rock Cycle

Rock Cycle

They have a huge variety of colors, shapes, textures, and sizes, but all rocks go through the same cycle, changing very slowly from one kind to another. Explore the rock cycle and transform a rock yourself. More...

Interactive
Annenberg Learner
Rocks: Stony Stalwarts

Rocks: Stony Stalwarts

What exactly is a rock? Find out how geologists answer that question. Then examine the "natural processes that glue rocks together." More...

Article
National Geographic
Origin of the Rock Layers of the Grand Canyon

Origin of the Rock Layers of the Grand Canyon

Billions of years ago, before the Colorado River carved the Grand Canyon, shallow seas covered a thick layer of sediment. Watch how time, heat, and pressure formed those rocks. More...

Video
Caltech
Radiometric Dating: Playing Half-Life Odds

Radiometric Dating: Playing Half-Life Odds

When it comes to answering the question "How old is that rock?" scientists turn to radiometric dating. Roll the dice to get a hands-on look at how an isotope decays. More...

Activity
Science Buddies
Rocks: Igneous, Metamorphic and Sedimentary

Rocks: Igneous, Metamorphic and Sedimentary

A rock is not just a rock. Geologists classify rocks based on where they came from and how they were made. More...

Article
Geology.com
Rocks: Test

Rocks: Test

Is your knowledge of rocks solid or a slippery gravel slope? Challenge yourself with this 12-question quiz. More...

Interactive
BBC
Sedimentary Rocks Contain Clues to Ancient Environments

Sedimentary Rocks Contain Clues to Ancient Environments

Over millions and millions of years, environments change. You can’t squeeze water from a stone, but you can see traces of it and find clues about the past in the evidence preserved in rock. More...

Article
Windows to the Universe
Smooth Rocks on Mars Tell Water Story

Smooth Rocks on Mars Tell Water Story

Certainly not unique to planet Earth, rocks make up our entire universe. And they tell scientists about a liquid that once flowed across the Martian landscape. What is it? More...

Video
JPL/NASA

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