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aa solidified basaltic lava flow on land that has formed with rough jagged surfaces Caldera a large crater shaped basin that formed after the top of a volcano collapsed Cinder Cone Volcano a cone shaped volcano that formed from lava fragments that have been ejected from a volcanic vent Composite Volcano a volcano made up of layers of hardened lava flow and pyroclastic materials Hot Spot an area of volcanic activity that results from a plume of hot solid material that has risen from deep within earths mantle Lahar a fast moving mud flow that occurs when the heat associated with a volcanic eruption melts snow and ice on top of a volcano Lava magma that has reached earths surface Lava plateau a plateau formed from basaltic lava pouring from a crack or fissure in earths surface Phahoehoe solidified basaltic lava that has formed with sooth rope like surfaces pillow lava lava that solidifies underwater and takes on a pillow like shape as it forms Pyrocrastic Flow a dense superheated cloud of gases and pyrocrastic materials that move rapidly down hill during a volcanic eruption Pyrocrastic materials solid rock fragments that are ejected during a volcanic eruption Shield Volcano a shield shaped volcano with gently sloping sides and a broad base that is made out of basaltic lava Viscosity a substances resistance to flow Volcano an opening in earths crust through that molten rock,gases and ash erupt, also land form that develops around this opening