Earth Science L10.1

​Earth Science L10

Lesson objectives
10.1: Describe geologic time and the geologic time scale.

Multiple Choice

The Law of Superposition states

• younger rocks laers are on top of older rock layers

• fossils are found in sedimentary rocks

• older rock layers are on top of younger rock layers

• absolute age dating

Multiple Choice

Which fossil would make the best index fossil?

• beetle

• flower

• frog

• fish

​Eon: The largest unit of geologic time; subdivided into eras.

Era: A unit of time shorter than an eon but longer than a period.

Period: A unit of time shorter than an era but longer than an epoch.

Epoch- Shortest unit of geological time

Multiple Choice

The geologic time scale is a record of....

• the history of fossils only

• the history of rocks

• the history of rock layers and fossils

• geologist notes

Multiple Choice

What is the largest unit of time on the geologic time scale

• era

• eon

• epoch

• period

Multiple Choice

Paleontologists infer that the earth is approximately how many years old?

• 4.5 million years

• 450 billion years

• 4.5 billion years

• 450 million years

Multiple Choice

Jellyfish are one of the oldest species on Earth. In what time period did they first appear?

• Precambrian

• Paleozoic

• Mesozoic

• Cenozoic

Multiple Choice

In which time period are we currently living?

• Precambrian Time

• Paleozoic Era

• Mesozoic Era

• Cenozoic Era

Multiple Choice

In what time period did Pangaea, the super continent, appear?

• Precambrian

• Paleozioic

• Mesozoic

• Cenozoic

Multiple Choice

Dinosaurs, small mammals, and birds are found in this time period.

• Precambrian

• Paleozioic

• Mesozoic

• Cenozoic

Multiple Choice

Which era was the longest, taking up 88% of geologic time?

• Precambrian

• Paleozoic

• Mesozoic

• Cenozoic

Multiple Choice

The end of an era, and the end of life for groups of organisms, is called?

• death

• mass extinction

• transition

• turning point

Multiple Choice

The end of the Mesozoic Era was most likely caused by?

• a meteor

• too much oxygen

• lowering sea levels

• an ice age