Page 176 - Science Course 3 (Book 2)

3. What is an equinox?

4. How do the lengths of daylight hours and nighttime hours everywhere on Earth compare on an equinox?

5. How does the tilt of Earth on its rotation axis relate to the change of seasons?

Mo12-L2: Key Concept Check

Direction: On the line before each effect, write the letter of the cause that correctly completes each
sentence. Some causes might be used more than once.

Cause
Effect

1. The light energy absorbed by a surface depends on
A. the surface tilts away from it.
2. A beam of light becomes more spread out as B. carries energy.

C. the beam of light reaches Earth.
3. Energy is carried to Earth in
D. the tilt of the surface.
4. Some energy is absorbed by Earth’s surface when
E. the beam of light is spread out more.

5. Energy is less concentrated near F. energy is concentrated there.
G. Earth’s poles.
6. Less energy reaches the poles because
H. tilt is the greatest there.
7. Earth is warmest at the equator because
I. energy absorbed by the surface.
8. Earth is coldest at the poles because J. a beam of sunlight.

K. is curved
9. Surface temperature depends on the amount of
10. The surface of Earth

11. Less energy is received in regions where
12. A beam of light

13. Earth is warm at the equator and cold at

168