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Amber is fossilized

The element that is most abundant in Earth’s crust is

The Paleozoic era ended with an event called the

The two elements silicon and oxygen, taken together, make up about what percent of Earth’s crust by mass?

Sediments are classified according to the source of their constituents into two main groups. One is chemical. What is the other?

Geology’s best tool for establishing absolute geologic time is

The study of minerals is called

The foundation of the science of geology rests on James Hutton’s theory of __________, which states that the present is the key to the past and provides the basis for the rock cycle model, a series of events through which rocks change over time.

Which occurrence is associated with the demise of the dinosaurs?

The sedimentary rock known as ______________ consists of angular pebbles cemented together by silica, calcium carbonate, or iron oxide.