Page 111 - Science Course 3 (Book 2)

Relative-Age Dating Mo11-L2a: What is Relative-Age Dating?
Lesson 2

inclusion
a piece of an older rock that becomes a part of a
new rock.
In this topic, you will learn the following
lessons:
Mo.11–L2a: What is Relative-Age Dating?

Mo.11–L2b: How to Determine the Relative Let’s Begin
Ages of Rocks?

Relative Age of Rocks
Mo11–L2a What is Relative-Age Dating? Relative age is the age of rocks and geologic
features compared with other rocks and features
KEY CONCEPTS: nearby.
1. What does relative age mean?

Vocabulary A-Z

Let us learn some vocabulary

relative age Superposition is the
principle that says in
the age of rocks and geologic features compared undisturbed rock layers,
with other nearby rocks and features. the oldest rocks are on
the bottom.
4 Youngest 4
3 Unless some force
3
2 disturbs the layers after
2 1 they were deposited,
1 Oldest each layer of rocks is
younger than the layer
below it.

Key Concept
4 4 Youngest 5
What is Relative-Age Dating?
3 3 3
2 4 2 How might you def ne your relative age?
1 Oldest 1

superposition
the principle that in undisturbed rock layers, the
oldest rocks are on the bottom.

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