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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.
The way lava flows can be described in terms of the size of the lava flow, the surface texture of the lava flow, and the structural makeup of the lava flow. If the lava features a continuous surface that is smooth, features ropy folds, and if the flow is thin in size, then it is described as a pahoehoe flow.t is liquid in form and is extremely hot. The force of the blast and the viscosity of the liquid causes lava to flow away from the volcano. The composition of lava affects the way it flows, the speed at which it flows, and the resulting rocks that develop when the lava cools.