What's the biggest (or heaviest) layer of the Earth?

What are rocks made of?

Minerals are made of chemicals. If I look at a minreal, it should look ____ _____ all over.

Where does dirt come from?

What substance causes most erosion?

Other than the main cause, what is one other source of erosion?

What type of rock is granite?

How can you tell that the Rocky Mountains are younger than the Appalachains? (not height)

Which rock type can have fossils in it?

Many metamorphic rocks are “foliated”. What odes this mean?

Gem stones are actually what?