Magma, when comes out on the surface of the earth through the volcanic opening, is called lava, hence option C is correct. The vent is the volcanic opening on earth's surface. Cone is the structure of the volcano formed as a heap of cooled materials that come out of volcanic eruptions ...
the mantle. Rift zones account for most of the places where lava flows onto Earth’s surface. Fissure eruptions often occur along rift zones. These eruptions form lava that cools and solidifies into basalt, the most abundant type of rock in Earth 裂口包含起通道作用对于发起于披风的岩浆的破裂...