what causes magma in the lower mantle of earth to rise up toward the crust? a. the moons gravitational force…
what causes magma in the lower mantle of earth to rise up toward the crust? a. the moons gravitational force acts on the magma. b. the core of earth expands. c. the density of the magma decreases. d. the volume of the magma decreases.
Answer
Brief Explanations:
When magma in the lower mantle heats up, its density decreases. Less - dense materials rise above more - dense materials in a fluid environment like the mantle. The moon's gravitational force mainly affects tides on the surface and not magma rise in the mantle. Earth's core does not expand to cause magma to rise. A decrease in magma volume would not cause it to rise.
Answer:
C. The density of the magma decreases.