Page 82 - Science Course 2 (Book 2)

The Earth’s Cycles Mo10-L2a: What is the Carbon Cycle?

Lesson 2

Let’s Begin

In this topic, you will learn the following
lessons:
Mo.10–L2a: What is the Carbon Cycle? Earth Systems
Mo.10–L2b: What is the Phosphorus Cycle? Earth has smaller systems that function together
and make the larger Earth system:
• the atmosphere
• the hydrosphere
• the geosphere
Mo10-L2a What is the Carbon Cycle? • the biosphere

KEY CONCEPTS: atmosphere
1. How do Earth systems interact in the carbon
cycle?

Vocabulary A-Z
Let us learn some vocabulary
Lithosphere Hydrosphere

carbon cycle
the series of processes that continuously move Matter and energy are transported among all Earth
carbon among Earth systems. systems.

The outermost Earth system is a mixture of gases
and particles of matter called the atmosphere.
It forms a layer around the other Earth systems.

greenhouse gas
a gas in the atmosphere that absorbs Earth’s The atmosphere is mainly nitrogen and oxygen
outgoing infrared radiation. gases.

These gases move freely, helping transport matter
and energy among Earth systems.

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