Earth History Unit

Radioactive elements contains atoms that give off

• particles

• mutations

• radiation

• elecromagnetic energy

A rock contains 25% radioactive material. How many half-lives have gone by?

• 3

• 2

• 1

• 4

Comparing the age of one rock sample to another rock sample is called

• absolute dating

• comparative dating

• relative dating

• geologic dating

___________________ is used to determine the actual age of a rock or fossil.

• dendrochronology

• absolute dating

• relative dating

• geology

The Period that makes up the greatest amount of time on the Geologic Timeline is

• The Jurassic Period

• The Quaternary Period

• Pre-Cambrian Period

• Permian Period

The largest mass extinction of life on Earth happened during the

• the end of the Cretaceous Period (Late Mesozoic)

• the end of the Permian Period (Late Paleozoic)

• the end of the Pleistocene Epoch (during the Quaternary Period)

• in the Pre-Cambrian Period

Which of the following is NOT a Period in the Mesozoic Era?

• Triassic

• Jurassic

• Pliocene

• Cretaceous

The Cenozoic Era is known as the

• Age of Mammals

• Age of fish

• age of reptiles

• here was no life during the Cenozoic Era

In sedimentary rock formations the younger rocks are typically found on top of older rocks layers, this is known as

• the cross-cutting Law

• the law of original horizontality

• law of super position

• the law of metamorphism

in a sedimentary rock formation where igneous rock has cut across layers the igneous rock is ____________________ compared to the layers of sediments

• oldest

• youngest

• age can not be determined

• igneous rock can not penetrate sedimentary rock