Lava Flow and Lava Sheet Landscape
A lava flow is a flow of molten magma like a lava river for a period of time, which eventually forms a landscape of molten lava. Its length is greater than its width. A lava sheet is characterised by a large coverage area, usually appears isometric in map view and can form through the stacking of numerous lava flows. The lava is usually relatively thick. The associated low-viscosity basaltic magma moves on the ground surface at velocities of several metres to tens of kilometres per hour. The lava in Hawaii can reach a velocity up to 60 km per hour. Wudalianchi in China has an intact lava flow landscape that is locally called a lava river or stone dragon.