Lesson 1
Spherical Earth
Scan Lesson 1. Read the lesson titles and bold words. Look at the pictures. Identify three facts
that you discovered about Earth’s systems or formation. Write these facts in your Science Journal.
Draw Earth as seen from space.
Describing Earth
.
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.
Compare Earth systems. Then explain how these systems
work together.
Atmosphere
Description:
Biosphere
Description:
Earth’s four systems exchange
Description:
the solid part
of Earth
Description:
and
. The
provides oxygen, the
provides the
provides the
water, and the
organisms in the biosphere a place to live and elements needed
for their survival.
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Earth’s Structure
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Lesson 1 | Spherical Earth (continued)
How did Earth form?
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Model the strength of gravitational force between two objects.
Draw arrows of different thicknesses to indicate the strength of the
gravitational force exerted by the objects in each pair.
A
B
Object A has a greater mass than Object B.
C
D
Objects C and D have the same mass.
Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
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.
Sequence the early events in the formation of the solar system.
A cloud of
gas, ice, and
dust called a
The nebula
pulled the
materials
closer
together.
and flattened
into a
.
.
The disk
began to
,
our Sun,
,
and the
materials in
the middle
became
.
Gravity
pulled the
remaining
bits of
material
together,
forming
.
.
Earth’s Structure
13
Lesson 1 | Spherical Earth (continued)
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Sequence the events that formed early Earth.
The newly
formed
Earth grew
Gravity pulled in the
irregular bumps, and
became soft
enough to
.
enough to
generate
.
.
The Formation of
Earth’s Layers
Draw and label the geosphere. Use these terms:
• least dense
.
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• middle layer
• most dense
Organize information about how the layers of the geosphere
formed.
The densest material
.
The least dense material
.
The materials with intermediate densities
.
Apply what you have learned about the formation of Earth to describe
how gravity influenced the formation of the planet Mars.
14
Earth’s Structure
Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
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