Age of the Earth
So far scientists have not found a way to determine the exact
age of the Earth directly from Earth rocks because Earth's oldest
rocks have been recycled and destroyed by the process of plate
tectonics. USGS.
Bitesize Science: Rocks and Soils
Rocks can be hard, soft, permeable or impermeable, depending on what type of rock it is. Slate, marble, chalk and granite all have different uses. Different plants grow better in different types of soil.
Colorado Geology Photojournals
The photojournals feature annotated images of sites of geologic
interest in Colorado. The groundwork articles provide background
information on Colorado geology, rocks and tectonics.
Geology Virtual Field Trips
Study guides provided. See if you can find the answers to the
questions as you visit interesting geology sites from around
the globe. Join in a discussion group.
GeoMysteries
Join Rex the Dino Detective as he solves mysteries about rocks,
fossils and minerals.
Mineral Town
Megasite for the Rock Hound. Ideas for field trips. Submit your
photographs. Find other rock hounds and events. Organize your
first rock
collection.
Rockhounding Arkansas
If you are a beginner or an accomplished mineralogist, you'll
want to read through the stories and information presented here
for the enjoyment of this fascinating hobby.
Rocks For Kids
If you already collect rocks then this is the place for you!
Find out where you can get more rocks, take a look at some super
pictures of rocks, learn how to identify the rocks you already
have and discover neat things you can do with rocks.
