1. Chapter 26-27: Test Review Planets, Asteroids, Sun

2. 1. These are examples of?
Sunspots

3. 2. Layer of the sun that radiats light. A. Core B. Photosphere C
2. Layer of the sun that radiats light? A. Core B. Photosphere C. Chromosphere D. Corona
B. Photosphere

4. 3. What process results in the sun’s energy source?
Nuclear Fusion

5. 4. What is the main difference between asteroids and comets?
Asteroids are rock, while comets are made of rock, gas and ice

6. The remains of meteoroids that have hit the Earth
5. What are meteorites?
The remains of meteoroids that have hit the Earth

7. 6. What evidence is there to suggest that asteroids have been involved in shaping moons and planets?
Impact Craters

8. 7. What region lies between Mars and Jupiter?
Asteroid Belt

9. 8. Massive explosive eruptions from our sun are called?
Solar Flares

10. 9. Why do comets have a tail?
Evaporation of ice and gases

11. 10. What is the most obvious difference between terrestrial and jovian planets?
Size

12. 11. The nebular theory states that the Solar System formed from ______ and ______.
Dust and Gas

13. 12. Which planet shows evidence that it once had water?
Mars

14. 13. The glowing head of a comet is called the:
Coma

15. 14. What layer of the sun is above the photosphere?
Chromosphere

16. 15. Which planet does not have an atmosphere?B.
Mercury A. C.

17. 16. List three main characterisitics of Jovian planetsB. A.
Large size
Composed mainly of gases
All have rings
Thick atmospheres C. D.

18. 17. The Aura Borealis results from the interaction of the _________ and Earth’s magnetic field.
Solar Wind

19. They are relatively cooler areas on the sun’s surface
18. Why are sun spots dark?
They are relatively cooler areas on the sun’s surface

20. 19. The biggest planet in our solar system is:
Jupiter

21. 20. What Planet is this:
Venus

22. 21. Why is Venus hotter than Mercury even though Mercury is closest to the sun?
Venus has an atmosphere almost entirely of CO2 (a main greenhouse gas)

23. 22. Why did the terrestrial planets form close to the sun and the jovian planets farther away?
Terrestrial planets have heavy, dense silicate materials that melted together to form the crusts on terrestrial planets. The sun’s gravity kept the heavy silicate materials closer than the less dense gases that floated farther away.

24. 23. What did Galileo conclude after observing sunspots?
The sun is rotating on its axis

25. 24. In nuclear fusion, what gas fuses with itself to form Helium and create energy?
Hydrogen

26. 25. The many impact craters on the moon provide evidence that Earth was bombarded with asteroids during its formation. But why can’t we see this evidence on Earth?
Weathering and plate tectonics have worn away or destroyed impact craters

27. Core, Photosphere, Chromosphere, Corona
26. List the four parts of the sun in order starting from the inside out.
Core, Photosphere, Chromosphere, Corona

28. 27. The sun has a grainy appearance due to :
Granuals

29. 29. What is one popular theory regarding the cause of mass extinctions recorded in Earth’s past?
Asteroid impacts are responsible for mass extinctions such as the dinosaurs.

30. 30. List three main reasons why the sun is important to life on Earth
Heat
Light (photosynthesis)
Variety of elements created by the sun