volcano - A spot in the crust where magma has come to the surface, earthquake - Shaking and vibration at the surface of the earth resulting from underground movement along a fault plane or from volcanic activity, Richter scale - A scale that rates an earthquake's magnitude based on the size of its seismic waves., Tsunami - A giant wave usually caused by an earthquake beneath the ocean floor., Elevation - The height of land above sea level, tectonic plates - Sections of the Earth's crust that move due to convection currents., Ring of Fire - A major belt of volcanoes that surrounds most of the Pacific Ocean, Magma - Molten rock beneath the earth's surface, Lava - Magma that reaches Earth's surface, pyroclastic flow - a dense, destructive mass of very hot ash, lava fragments, and gases ejected explosively from a volcano and typically flowing downslope at great speed., volcanic ash - Sand-sized particles of igneous rock that form when a spray of liquid magma is blown from a volcanic vent by escaping gas., hot spot - a volcanically active area of Earth's surface far from a tectonic plate boundary, Molten Rock - rock that is so hot it is a very thick, slow-moving liquid., Vent - The opening through which molten rock and gas leave a volcano, Ocean Trench - Deep valley in the ocean floor that forms along a subduction zone,

Earth Vocab #1

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