Page 128 - Science Course 1 (Book 2)

Mo9-L4: Key Concept Check

Direction: On the line after each item, write conduction, convection, or radiation to indicate the type of
thermal energy transfer that it represents.

1. the warming rays of the Sun

2. the f ow of ocean currents

3. a branding iron making a mark

4. hot feet from hot sand

5. a cool breeze

6. heat from glowing coals

7. high-altitude air streams

8. the warmth of a heating pad

Direction: On the line before each item, write A if it involves the absorption of thermal energy, or write R if
it involves the release of thermal energy.

9. water freezing

10. ice melting

11. water evaporating

12. water vapor condensing

Mo9-L4: Lesson Review Quiz (Multiple Choice)

Direction: On the line before each question or statement, write the letter of the correct answer

1. Most of the energy that reaches Earth from the Sun is
A. visible light.
B. ultraviolet light.
C. infrared radiation.

2. When the Sun’s energy reaches Earth,
A. most of it is absorbed by clouds.
B. more than 90 percent of it is ref ected.
C. about half of it is absorbed by Earth’s surface.
3. Why doesn’t Earth become hotter with time as the Sun shines on it?
A. The Sun gives off less energy every day.
B. Earth sends back into space the same amount of energy it receives.
C. Earth’s greenhouse effect is not strong enough to heat up the planet.

4. Which gases are most responsible for the warming that occurs with the greenhouse effect?
A. nitrogen and oxygen
B. methane and carbon monoxide
C. carbon dioxide and water vapor

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