Lava forms are geological structures created by the movement and cooling of molten rock, or lava, from a volcano. When lava erupts, it can take various shapes depending on its composition, temperature, and the environment in which it cools. Common types of lava forms include pahoehoe, which is smooth and ropy, and aa, which is rough and jagged. As lava flows and solidifies, it can create features such as lava tubes, which are hollow channels formed by flowing lava, and lava plateaus, which are extensive flat areas created by repeated lava eruptions. These formations provide valuable insights into volcanic activity and the Earth's geological history.