What causes magma in the lower mantle of earth to rise upward toward the crustthe moons gravitational force acts on the magmathe core of earth expandthe density of the magma decreases the volume of the magma decreases

In 1915 the german geologist and meteorologist alfred wegener first proposed the theory of continental drift, which states that parts of the earth's crust slowly drift atop a liquid core. the fossil record supports and gives credibility to the theories of continental drift and plate tectonics.

How many countries have portuguese as a national language?

How long does it take neptune to orbit the sun?