Rock Layers (Geologic Time)

Front

Dinosaurs lived in the ___________ era.

Back

Mesozoic

Front

A ________ is a scientist that studies the composition of the Earth, including rock layers.

Back

Geologist

Front

When sediment is moved around by wind or water it is called ________.

Back

Erosion

Front

Scientists use ______ dating to figure out the exact age of something.

Back

Absolute

Front

The geologic time scale represents Earth's ________ year history.

Back

4.6 billion

Front

The process of breaking down rocks into smaller pieces is called ________.

Back

Weathering

Front

The study of fossils is known as ________.

Back

Paleontology

Front

The oldest rock layers are found at the ________ of a rock formation.

Back

Bottom

Front

The principle that states younger layers of rock are deposited on top of older layers is called ________.

Back

Superposition

Front

A ________ is a gap in the geologic record that shows where rock layers have been eroded away.

Back

Unconformity