Which of the following statements about volcanic eruptions is true? A. Volcanoes store nuclear energy, causing them to erupt.

B. Convection currents in the mantle cause magma to rise to the surface and erupt from the volcano.

C. Volcanic eruptions occur when the internal pressure within the volcano drops below the pressure of the surrounding rock.

D. Magma erupts from the volcano because magma is only composed of gas bubbles, making it less dense than the rock around it.