What is the most likely cause of the sinuous feature that extends across the following radar image of Venus?

Which planetary bodies have or had a hydrologic system involving a liquid on the surface (not from lava eruptions)?

Which of the following is true about Europa?

Large amounts of water (as gas or liquid) on Venus ________.

What is the sinuous feature that extends across this image of the surface of Venus?

The following images are of two of Neptune’s moons. In the photos, both are about the same size; in reality one has a much larger diameter. Which one is larger?

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 Mars?

This image shows the surface of Ganymede. What relative age is the impact structure indicated with arrows? 

What type of star may have died to form this beautiful feature that is several light years across? 

Put the major events in the history of Mars in the correct order using the following sketches of Mars and the drop-down boxes below. Place the letter for the oldest event (what happened first) on the bottom and for the youngest event (most recent) on the top. [1] (youngest—what happened most recently) [2] [3] [4] [5] [6] (oldest—what happened first)