Comment Re:Bigger than the Grand Canyon Taller than Everes (Score 4, Interesting) 77
Really it's impressive before you think about it. The Earth has active plate tectonics and ongoing weathering. It should come as no surprise that planets which don't have more pronounced features.
Also, the Earth has much higher gravity. Surface elevation gradients are much more pronounced on bodies with lower surface gravity, even though they have higher tidal gradients. Mars' largest volcano, Mons Olympus, could not stand on Earth due to the 3x higher gravity here.