Chapter 22 Review Questions 1. By what criteria are the planets placed into eith

Question

Chapter 22 Review Questions

1. By what criteria are the planets placed into either Jovian or terrestrial group?

2. Explain why the terrestrial planets have meager atmospheres, as compared to the Jovian planets?

3. Briefly outline the history of the moon. The moon was formed about 4.5 billion years ago.

4. What surface features does mars have that is common on earth?

5. Why are the largest volcanoes on earth smaller than the ones on mars?

6. What is the nature of Jupiter’s Great Red Spot? 16. How are Jupiter and Saturn similar?

7. What two rolls do ring moons play in the nature of planetary ring systems?

8. What do you think would happen if earth passed through the tail of a comet?

9. Compare: meteoroid, meteor, meteorite.

10. What are the three main sources of meteoroids?

11. Why are impact craters more common on the moon than on earth, even though the moon is a much smaller target and a weaker gravitational pull?

Explanation / Answer

1. The planets are placed in terrestrial group because of various factors, such as size of the planets, their composition, their density, etc. Even the rotation rate is used for classification.

2. Jovian planets are huge in size and mass, thus they have greater gravity. This enables them to hold both heavy and light gases. Whereas, Terrestrial planets are smaller in size, thus gravity is sufficient to hold only heavy gases.

4. The common features include sand dunes, volcanoes, canyons.

10. Sources of meteoroids= Asteroid, Comets, Interplanetary debris.

16. Both Jupiter and Saturn are Jovian planets having large size and more number of satellites. They have ring systems. Presence of dynamic atmosphere and cyclones, storms are also common.

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