Geologic Time Summative Review

Front

What does the Letter R represent in geology?

Back

Intrusion/Magma

Front

What is the order of the Eras from oldest to youngest?

Back

Precambrian, Paleozoic, Mesozoic, Cenozoic

Front

Why can fossils from animals that only live in water be found inland?

Back

The land was once covered by water.

Front

How do crosscutting relationships explain the age of a fault caused by an earthquake?

Back

The fault is younger than rocks it cuts through.

Front

How do the ages of rock samples from space compare to rocks found on the Earth?

Back

They are the same age.

Front

What is the significance of the Precambrian Era?

Back

It is the longest era in Earth's history, covering about 88% of geological time.

Front

What are fossils and how are they formed?

Back

Fossils are preserved remains or traces of ancient organisms, formed through processes like mineralization.

Front

What is the principle of superposition in geology?

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 a fault in geological terms?

Back

A fault is a fracture in the Earth's crust along which movement has occurred.

Front

What is the difference between magma and lava?

Back

Magma is molten rock beneath the Earth's surface; lava is magma that has reached the surface.