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Click on the possible explanations for Mercury’s large core. Choose the two most likely.

Using the following shaded relief map, select a convergent plate boundary.

What would have happened on Venus if it had been cool enough for liquid water to form?

Answer one of the following questions: The Moon has two distinctive geologic provinces that reveal much about its geologic history. With this in mind, explain why the lunar highlands are more intensely cratered than the maria. Knowing that the vast majority of meteorites have ages between 4.5 and 4.6 billion years, what would you conclude if you found a distinctive category of stony meteorites that had ages of about 1 billion years? On what kind of body would these meteorites have formed?

The following images show impact craters on the Moon, Mars, Venus, and the Earth. Each has distinctive features because of the geologic processes that affect the surface. Which image is of a crater on Venus?

Water is not the only substance capable of forming a hydrologic system—if we define it to be a system of flowing fluids that includes a liquid stable at the surface temperature of the planetary body. Which of the following has a hydrologic system?

Examine the following image of Mars carefully, and then select the letter associated with a shield volcano.

What is the currently favored theory for the origin of the Moon?

Using the following shaded relief map, select a divergent plate boundary.

What are the circular features with dark centers?