309 b. Label each point with the planet\'s name. 2. What relationship exists bet

Question

309 b. Label each point with the planet's name. 2. What relationship exists between a planet's s size (diameter) and its density? 3. The average density of Earth's crust is about 2.8 g/cm Is the average density of the terrestrial planets greater or less than the density of Earth's crust? 130 4. The average density of Earth 5/'. Since the density of Earth's crustal rocks is only about is about .5 gcm 2.8 g/cm, what does this indicate about the density of Earth's interior? 5. What could explain the fact that Mars has a some what lower average density than the other terrestrial planets? 6. Compare the densities of the Jovian planets to the density of water. (Note: Water has a density of about g/cm CIO IT CTI 7. Which of the planets has a density less than that of water and, therefore, would "float" nC/ 5.0 6.0 4.0 Density ( 1. Is 8. Explain why Jupiter is such a massive object and yet has such a low . density(Hint: Remember that density is the relationship between mass and volume.) FIGURE 18.2 Diameter versus density graph The Cons the s 9. Write a general statement comparing the densities of the terrestrial planets to the densities of the Jovian planets. The o bf Plu 10. Why are the densities of the terrestrial and Jovian planets so different? (HintSee Section 18.1) 18.5 Rotation and Revolution of the Planets All the planets, with the exception of Venus, rotate about their axis in a counterclockwise action. Venus exhibits a very slow clockwise rotation. The time that it takes for a planet omplete one 360° rotation on its axis is called its period of rotation. The units used to express a planet's period of rotation shown in Table 18.1 are Earth hours and days Revolution is the motion of a planet around the Sun. The time that it takes a planet te one revolution about the Sun is the length of its yearcalled the period of volution. The units used to express a planets period of revolution are Earth days and Without exception, the direction of revolution of the planets is counterclockwise around the Sun. (From a Northern Hemisphere point of view.) to comp

Explanation / Answer

2. The planets size is inversely proportional to its density. We know density is equal to mass divided by volume. Greater the volume lesser is the density.

3. The average density of the Earth's crust is 2.8gram per cubic centimetre. And the average density of the other terrestrial planets is 5.40gram per cubic centimetre. So, the average density of the terrestrial planets is more than the average density of the earth's crust.

4. As the density of the earth's crust is 2.8grams per cubic centimetre and the average density of the overall earth is 5.5 gram per cubic centimetre it indicates that the earth's interior is comprised of dense materials.

5. Mars has a lower density than the other terrestrial planets because it has a greater thickness of crust(which is of a lower density)

6. Jovian planets have hydrogen, helium, methane, water gas in their outer atmosphere and thus have a lower density which varies from 0.7-1.7gram per cubic centimetre.

7. Saturn has lesser density than water so it can float.

8. Jupiter has lesser mass and greater volume, and so it has a lesser density.

9. The density of terrestrial planets is more than that of jovian planets.

10. The jovians seem to have about the same chemical composition (by element) as the Sun: 75% hydrogen, 24% helium, and only 1% everything else. The terrestrials, however, being unable to hold on to the lightest gases gravitationally, have very little hydrogen and helium, and are made mostly of much heavier elements. The most abundant atom in the body of the Earth, for example, is oxygen (mostly locked up in molecules with other elements), each atom of which weighs 16 times as much as each hydrogen atom does. Having less mass and greater volume as compared to terrestrial planets, the density of jovian planet is less.

And its not clear to me whether I should be answering the questions of the next page. Because answers are already written.

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