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Why can diamonds form in the mantle?

a.the weight of the rocks above the mantle results in high pressure.
b.the weight of the rocks in the outer core results in high pressure.
c.the weight of the rocks in the outer core increases the temperature.
d.the sun and moon cause a low pressure in the upper mantle?

User OldWest
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The answer in this question is A the weight of the rocks above the mantle results in high pressure.The reason why diamond form in the mantle is that the weight of the rocks in the crust and upper mantle results in the pressure that allows the diamonds to form. 
User Ould Abba
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