4. Which of the following is true about all of the outer plants?
a. Much of the material in these plants is solid.
b. The surface of these plants is rocky.
c. They have many moons.
d. They all rotate in the same direction.***
I assume the question refers to direction of revolution around the sun and therefore agree.
To determine which of the options is true about all of the outer planets, we need to gather information about these planets.
The outer planets, also known as the gas giants or Jovian planets, are Jupiter, Saturn, Uranus, and Neptune. Here is how we can analyze the provided options:
a. Much of the material in these planets is solid: This option is not true. The outer planets are primarily composed of hydrogen and helium, which are gases, with only a small rocky core.
b. The surface of these planets is rocky: This option is not true. The outer planets do not have a solid surface like the inner, terrestrial planets. Instead, they have dense atmospheres with no distinct solid surface.
c. They have many moons: This option is true. All of the outer planets have multiple moons. For example, Jupiter has over 80 moons, Saturn has over 80 moons, Uranus has 27 moons, and Neptune has 14 moons.
d. They all rotate in the same direction: This option is true. All of the outer planets rotate in the same direction, counterclockwise as viewed from above their north poles.
Therefore, the correct option is d. They all rotate in the same direction.