Why are mountains on Mars taller than mountains on Earth?

The height of the mountain is determined by the limiting mechanical stress, at which the crystal lattice begins to collapse. Mechanical stress depends on the weight of the mountain. The weight of bodies on Mars is less than on Earth, about 2.5 times. With the same mechanical properties of rocks on Earth and Mars and the same mountain-building activity, the height of the highest mountains on Mars should be about 2.5 times the height of mountains on Earth, which is confirmed by observations. The highest mountains on Mars (Arsia, Akreus, Pavonis, Snow Olympus) are 25 – 27 km high.

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