ESS1C Geologic Time

Front

In rock layers, the YOUNGEST rocks are found on the _____ layer.

Back

top

Front

The evidence remains of living plants or animals preserved in rock are called

Back

fossils

Front

What is a bed or LAYER of sedimentary rock having approximately the same composition throughout?

Back

rock strata

Front

Which fossil is the youngest?

Back

1

Front

What time period makes up 90% of Earth's history?

Back

Precambrian Time

Front

What is the principle that states that in undisturbed sedimentary rock layers, the oldest layers are at the bottom?

Back

Law of Superposition

Front

What are the divisions of the geologic time scale from largest to smallest?

Back

Eon, Era, Period, Epoch

Front

What is the significance of index fossils in geology?

Back

Index fossils are used to identify and date the layers of rock in which they are found.

Front

What is the difference between relative dating and absolute dating?

Back

Relative dating determines the age of rocks in relation to other rocks, while absolute dating provides a specific age.

Front

What is the term for a gap in the geologic record?

Back

Unconformity