Question

Continental crust forms from magma that has often undergone several heating and cooling cycles. Each time a mass of magma cools and reheats, its volume increases by a small amount. Assume that a mass of magma is constant. What effect will an increase in volume have on the density of the magma?

Answer 1

As higher temperature lead to the expansion of magma,the volume will increase hense lowering the density of the magma

Reason why the density is lowered is because the mass remains constant, as they're expanded,the particles are further apart,thus the desity is lowered.

Hope it helps!

Answer 2

Magma is formed under the Earth's crust is a hot liquid or semi-liquid material.  

Constant mass of magma

The magma is seen as increasing with an increase in temperature under the crust. Hence, it leads to the expansion of its volume thereby decreasing its density.

Therefore, this lower density is caused due to constant mass of magma.  It means the particles of the materials are seen as moving apart which lowers down its density.

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