25. Extreme Terrain • Earth.com 25. Extreme Terrain

Photos prove the terrain on Mars is far more rugged than Earth’s, and much of that actually has to do with the planet’s gravitational pull. Because the pull is only 37 percent as strong as Earth’s, volcanoes —like the Olympus Mons pictured here — can grow 16 miles high! Photo Credit: NASA / MOLA Science Team

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