Page 151 - Science Course 2 (Book 2)

Continental Drift Mo11-L4a: What is Continental Drift?
Lesson 4

Let’s Begin

In this topic, you will learn the following
lesson:
Mo.11–L4a: What is Continental Drift? Pangaea
Nearly 100 years ago, Alfred Wegener proposed that
all the continents were once part of a supercontinent
called Pangaea.
Mo11-L4a What is Continental Drift?
Over time, Pangaea began breaking apart and the
KEY CONCEPTS: continents slowly moved to their present position.
1. What evidence supports continental drift?
2. Why did scientists question the continental
drift hypothesis?

Vocabulary A-Z

Let us learn some vocabulary

Pangaea
name given to supercontinent that began to break
apart approximately 200 million years ago.

Wegener proposed the hypothesis of continental
drift, which suggested that continents are in
constant motion on the surface of Earth.

Wegener observed the similarities of continental
coastlines now separated by oceans and how they
could f t together like pieces of a puzzle.

continental drift
Wegener’s hypothesis which suggested that conti-
nents are in constant motion on Earth’s surface.

The eastern coast
of South America
mirrors the shape
of the west coast
of Africa.

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