Unit 8: Geologic Time Scale Assessment

Front

What is a meteorite?

Back

A rock from space that lands on Earth.

Front

What are strata?

Back

Layers of rock or soil that build up over time.

Front

What is a mass extinction event?

Back

When many plants and animals die out in a short period of time.

Front

What is geologic time?

Back

Time that begins with Earth's formation to the present era.

Front

What is half-life?

Back

Time it takes for half of the radioactive material in something to break down.

Front

What is the significance of the geologic time scale?

Back

It helps scientists understand Earth's history and the timing of events.

Front

What are fossils?

Back

Remains or traces of ancient organisms preserved in rock.

Front

What is the principle of superposition?

Back

In undisturbed layers of rock, the oldest layers are at the bottom.

Front

What is radiometric dating?

Back

A method used to determine the age of rocks and fossils using radioactive decay.

Front

What is a geological era?

Back

A major division of geological time, consisting of multiple periods.