Geology Test Review

Magma that forces its way into rocks and hardens is called a(n)___. 

• Intrusion
• Extrusion
• Lava
• Unconformity 

A petrified fossil forms when _. 

• The bone is replaced with sediment.
• The organic material is replaced with minerals.
• The bone is replaced with minerals.
• When amber replaces the soft parts of an organism.

When did the earliest forms of life appear?

• Mesozoic Era 
• Paleozoic Era
• Cenozoic Era
• Precambrian Time

On the Geologic time scale, eras are divided into ___. 

• Epochs
• Periods
• Eons
• Chapters

Fossils provide evidence for all of the following except.

• Sounds the animals made.
• How big organisms were.
• How organisms have changed over time.
• Where organisms lived long ago. 

When did the Cambrian Explosion occur?

• Devonian Period
• Precambrian Time
• Cambrian Period
• Mesozoic Era

Most fossils form when organisms die and are buried in ___. 

• Oil
• Tar
• Dust
• Sediment

What do you call a scientist who studies fossils?

• Geologist
• Paleontologist
• Fossilist
• Biologist

A gap in the rock record where eroded layers have been lost is known as a(n) _____. 

• Weathering
• Earthquake
• Law of Supervision
• Unconformity

A major extinction occurred at the end of the Cretaceous Period. 

• True
• False