Relative Age of Rocks

Front

Geologists use the law of _________ to determine the relative ages of sedimentary rock layers.

Back

superposition

Front

The intrusion is older than layer C. True or False?

Back

True

Front

What are the relative ages of the features in order from oldest to youngest? Limestone, Siltstone, Fault, Basalt.

Back

Limestone, Siltstone, Fault, Basalt

Front

According to the law of superposition, which layer is the youngest? A, B, or C?

Back

A

Front

Why do intrusions and extrusions of igneous rock not have any fossils in them?

Back

The high temperature of the magma destroyed any remains of organisms.

Front

What is the law of superposition?

Back

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

Front

Define 'intrusion' in geology.

Back

An intrusion is a body of igneous rock that forms when magma pushes into pre-existing rock layers.

Front

What is an 'extrusion' in geology?

Back

An extrusion is lava that has erupted onto the Earth's surface, forming igneous rock.

Front

What are index fossils?

Back

Index fossils are fossils of organisms that lived during a specific time period and are used to date rock layers.

Front

How do geologists use fossils to determine relative age?

Back

Geologists compare the types of fossils found in different rock layers to establish their relative ages.