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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.
In a shield volcano, 90% of the volcano is lava rather than pyroclastic material. Due to high magma supply rates, the lava is hot and changes very little after it is generated.hield volcanoes tend to erupt non-explosively, mainly pouring out huge volumes of fluid lava. Hawaiian-type eruptions are rarely life threatening because the lava advances sl â¦ owly enough to allow safe evacuation of people. 6 people found this useful.