Unit 7 Lesson 1: Energy Transfer

As water is heated by the sun, it becomes less dense and rises. What causes the decrease in the density of warming water?

• A water particles move faster, causing the water to expand.

• The water particles move slower, causing water to expand.

• The water particles move faster, causing the water to contract.

• The water particles move slower, causing the water to contract.

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Sarah is investigating the transfer of energy in the form of heat. One process that transfers energy between two objects is conduction. Which statement is NOT true about conduction?

• It can transfer energy through empty space.

• It requires direct contact between the objects.

• It involves a transfer of energy in the form of heat.

• It results in a change of temperature in both objects.

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During the day, the portions of Earth's surface that receive sunlight absorb energy in the form of heat. During the night, Earth's surface radiates this energy back into space. What is the main form of radiation released by Earth at night?

• Visible light

• Gamma rays

• Infrared radiation

• Ultraviolet radiation

Light from the sun heats the Earth's atmosphere. When the air becomes warmer, it expands, resulting in weather patterns. Which type of energy increases as air expands?

• Kinetic energy

• Nuclear energy

• Chemical energy

• Electrical energy

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How does energy move through the Earth's system?

• Conduction only

• Convection only

• Radiation only

• Conduction, Convection, and Radiation

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What is Earth's main energy source?

• Conduction

• The Sun

• Convection

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What happens when two objects at different temperatures touch?

• Geo-sphere

• Energy is transferred

• Electromagnetic

• Energy is NOT transferred

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What is an example of convection in Earth's system?

• There are no example of convection in Earth's system.

• Two examples are the atmosphere and geosphere

• There are only examples of radiation in the Earth's systems.

• Any transfer of energy

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