Page 104 - Science Course 3 (Book 1)

The Formation of Fossils Mo3-L1a: How are Fossils Formed?
Lesson 1

Cast
a fossil copy of an organism made when a mold
In this topic, you will learn the following of the organism is filled with sediment or mineral
lessons: deposits.

Mo.3–L1a: How are Fossils Formed?
Mo.3–L1b: What is the Evidence for Evolution?

Mo3-L1a How are Fossils Formed?

KEY CONCEPTS:
1. How are fossils formed?
2. How do scientists date fossils?

Trace Fossils

Vocabulary A-Z a preserved evidence of the activity of an organism.
Let us learn some vocabulary

Fossil Record

record of all the fossils ever discovered on Earth.

Let’s Begin

The Fossil Record

The fossil record is made up of all the fossils ever
discovered on Earth.
The fossil record provides evidence that species
have changed over time.

Mold
the impression of
an organism in a
rock.

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