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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?

Why is the Earth a dynamic planet, whereas the Moon and Mercury have undergone very little change during the last 3.5 billion years? (Select all that apply.)

Why is the Earth a dynamic planet, whereas the Moon and Mercury have undergone very little change during the last 3.5 billion years? (Select all that apply.)

What is the probable origin of the features shown in the following image of the surface of Mars?

Select the letter on the following cross section of Earth that shows where the Silicic continental crust is made.

In which ways is the Oort cloud different than the Kuiper Belt? (Select all that apply.)