Answer:
The answer is Ural Mountains.
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686.98 Earth days or 1.88 Earth years. Now, given that a day(sol) on Mars is longer than on Earth.</span>
<span>Diamonds cam form in the mantle because </span>of the impact of the weight<span> of the overlying </span>rock<span> which bears down on it, in combination with the high temperature of the area where they are formed (about </span>100 miles beneath the surface). Therefore, the correct answer is option D. <span>The weight of the rocks above the mantle results in high pressure.</span>