Rock Layers

Front

What is the geologic time scale?

Back

A model scientists use to describe the timing of events and the relationships between those events in Earth’s history.

Front

What does relative dating involve?

Back

Placing rocks in order from youngest to oldest.

Front

Which layer is older: Layer E or Intrusion A?

Back

Intrusion A.

Front

Which rock layer is typically the oldest in a sequence?

Back

The bottom layer, often referred to as the oldest layer.

Front

What type of rock is a conglomerate?

Back

A sedimentary rock composed of rounded fragments.

Front

What is the significance of the Law of Superposition?

Back

In an undeformed sequence of sedimentary rocks, the oldest layers are at the bottom and the youngest are at the top.

Front

What is an intrusion in geology?

Back

A body of igneous rock that has crystallized from molten magma beneath the Earth's surface.

Front

What is a breccia?

Back

A sedimentary rock composed of angular fragments.

Front

What is shale?

Back

A fine-grained sedimentary rock formed from mud and clay.

Front

What is sandstone?

Back

A sedimentary rock composed mainly of sand-sized mineral particles.