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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 Lava is molten rock expelled by a volcano during an eruption. 2  A lava flow is a (moving) outpouring of lava, which is created during a non-explosive effusive eruption. 3  When it has stopped moving, lava solidifies to form igneous rock.The composition of a lava determines its behavior more than the temperature of its eruption. The viscosity of lava is important because it determines how the lava will behave. Island-arc magmas are generated in metosomatically altered mantle.hen it has stopped moving, lava solidifies to form igneous rock. The composition of a lava determines its behavior more than the temperature of its eruption. The viscosity of lava is important because it determines how the lava will behave.