Unit 3: Geologic History Review

Unit 3: Geologic History Review

​Lesson Objectives

​Students will recall concepts of geologic history learned in Unit 3.

Fill in the Blanks

Quick Check:

A way of finding out the actual age of an object or event is known as

.

​Review: Absolute Dating

​Absolute dating is a way of finding out the actual age of an object or event; it is the most accurate way to determine absolute age.

Multiple Choice

The process of finding out if one object or event is older or younger than another object or event is referred to as __________.

• absolute dating

• relative dating

• unconformity

• age

​Principle of Superposition

• younger layer of rocks sit atop older layers of rocks (ex. sandwich analogy)​

Multiple Choice

The principle of lateral continuity is...

• a way of finding out the actual age of an object or event; most accurate way to

  determine absolute age

• a way of finding out if one object or event is older or younger than another object or

  event

• sediments spread out in all directions until they either thin out or run into a barrier

​Principle of original horizontality:

​sedimentary rocks are deposited in approximately horizontal layers

​Unconformity

​a gap in the rock record that indicated a time where no deposition has occurred, or where erosion has taken place

Multiple Choice

The scientific principle stating that specific groups of organisms have followed, or

succeeded, one another in a definite sequence through Earth history is known as________.

• Absolute Dating

• law of faunal succession

• Unconformity

• Principle of lateral continuity

​Geologic time scale:

​A vertical sequence of events of earth’s geologic history arranged in order of time.

Open Ended

Why can scientists look at rock layers to get information about the

geologic record?

Why can scientists look at rock layers to get information about the

geologic record?​

ANSWER: The layers of rock have different ages, with oldest layers on the bottom and youngest layers are on top.​

Multiple Choice

Which process within the Earth compresses strata?

• faulting

• folding

• absoulte age

• fossil

​Processes within Earth

• folding - process within the Earth that compresses strata

• ​faulting - process within the Earth that causes cracks in the strata

Multiple Choice

A fossil formed from the

footprints, burrows, or other

activities of a living organism is called a _________fossil.

• trace

• body

• index

• fossil

Fill in the Blanks

Write the lengths of geologic time from largest to smallest:

Thank you!​