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Sedimentary Rocks

Chert sits on mudstone

They're quiet types . . . they keep to themselves. But sedimentary rocks have true grit.

Some Special Sedimentary Rocks
Geology Spotlight10

The Expanding Earth Animation

The familiar expanding-Earth animation is an optical illusion based on a conceptual illusion.

The Promise and Pitfalls of Float

Float - loose rocks in the soil - can yield useful geologic information in areas where the bedrock is hidden.

Earthquakes in a Nutshell

Start here for the seismic basics: faults that cause earthquakes, types of seismic waves, damages they cause and more.

How to Read a Geologic Map

Understanding geologic maps starts with topography.

Official State Gems

Thirty-five states have official gemstones. Here they are, listed by state.

Gemstones to Minerals, Minerals to Gemstones

Big list of mineral names and their corresponding gemstone names.

About Geothermal Energy

Geothermal energy exploits the Earth's natural heat budget.

Coal in the Home

Americans don't burn coal at home any more, but it still works for much of the world.

Returning Rocks to Where They Came From

Is it so strange to bring a stone back to the place I got it from?

Abrasive Minerals

A survey of 9 mineral substances whose properties make them useful abrasives.

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