Geologic Time

Front

Rock layers form ______ due to gravity.

Back

horizontally

Front

Stratigraphy is the study of __________.

Back

rock layers and layering

Front

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

Back

rock strata

Front

As you travel deeper DOWN into the Grand Canyon, the rocks get _____.

Back

older

Front

A paleontologist is a scientist who studies _______.

Back

fossils

Front

What is the geologic time scale?

Back

A system that describes the timing and relationships of events in Earth's history.

Front

What does the law of superposition state?

Back

In undisturbed rock layers, the oldest layers are at the bottom and the youngest are at the top.

Front

What are fossils?

Back

Remains or traces of ancient organisms preserved in rock.

Front

What is sedimentary rock?

Back

Rock formed from the accumulation and compaction of mineral and organic particles.

Front

What is the significance of the Grand Canyon in geology?

Back

It provides a visible record of Earth's geological history through its rock layers.