Earth's History 9 Weeks Test

The Law of Superposition helps scientists to determine what?

• The absolute age of rock layers
• The age of fossils
• The relative age of rock layers
• the super powers of rocks

Index fossils are useful because they tell the __________ of the rock layers in which they occur.

• absolute age

• apparent age

• relative age

• temporary age

What was one bad result of the Great Oxygenation Event?

• Nothing, it only helped Earth.

• It cause the mass extinction of the anaerobic bacteria.

• It cause Snowball Earth to happen.

• It caused all the plants to die on Earth.

A fault can be used to find the __________________of a group of rocks.

• absolute age

• radiometric age

• indexed age

• relative age

Which is the SMALLEST unit of time on a geologic time scale?

• Supereon

• Eon

• Era

• Period

Use this geologic profile to answer the following question.

Which of the following BEST describes the fossil at Point 3 when compared with the fossils at Points 1 and 2?

• The fossil at Point 3 is less common

• The fossil at Point 3 is smaller.

• The fossil at Point 3 is older.

• The fossil at Point 3 is more complex

Mammals are a dominant group in which era?

• Cenozoic

• Mesozoic

• Paleozoic

• Cambrianozoic

Scientists estimate that if index fossils were deposited during a certain time frame, then the entire rock layer was also deposited at the same time.

A scientist finds Trophite fossils. According to the chart above, in what era and period was this rock layer deposited?

• Cenozoic era; Tertiary period

• Mesozoic era; Triassic period

• Paleozoic era; Permian period

• Paleozoic era; Mississippian period

the amount of mass in an object per its unit of volume

• density

• plastic

• volume

• mass

What type of event usually marks the end of an Era

• A Mass Extinction

• A Quinceanera

• An earthquake

• A Volcanic Eruption