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.
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.