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When magma reaches the surface of the earth, it is called lava. Since it its a liquid, it flows downhill in response to gravity as a lava flows. Different magma types behave differently as lava flows, depending on their temperature, viscosity, and gas content. Lava flows are produced on the surface, and these run like liquids down slope, along the lowest areas they can find. 2  If the magma emerges along a fracture, it results in a fissure eruption, often called a curtain of fire. 3  Lava flows produced by eruptions under water are called pillow lavas.
1 Pressure builds and magma explodes to the surface causing a volcanic eruption. 2  The lava from the eruption cools to form new crust. 3  After several eruptions, the rock builds up to form a volcano.4  The magma chamber is a collection of magma below the volcano.ey points. 1  Volcanic eruptions can happen at destructive and c onstructive boundaries. 2  Volcanoes form when magma rises through cracks or weaknesses in the Earth's crust. 3  Pressure builds and magma explodes to the surface causing a volcanic eruption. 4  The lava from the eruption cools to form new crust.