Question 22
Source instructions: For multiple choice problems circle the right answers. Some problems may have more than one right answer. For essay problem, give explanation briefly.
We know that our Earth and Moon have ball-shaped shapes. The figure is the picture of our Earth and Moon taken by an astronaut in a space shuttle. As you can see from the picture, the Earth and Moon shapes seem to be non ball-shaped, instead their shape look like a half of sphere. Explain why.

We know that our Earth and Moon have ball-shaped shapes. The figure is the picture of our Earth and Moon taken by an astronaut in a space shuttle. As you can see from the picture, the Earth and Moon shapes seem to be non ball-shaped, instead their shape look like a half of sphere. Explain why.
