Natural Disasters Power Point Presentation

style.visibilityppt_xppt_yppt_yppt_yppt_y INDEX{08FB837D-C827-4EFA-A057-4D05807E0F7C}SERIALNUMBERTITILEPAGE NUMBERREMARKS1.EARTH’S STRUCTURE42.EARTHQUAKES5-103.VIDEO ON EARTHQUAKES114.VOLCANOES12-175.VIDEO ON VOLCANOES186.WEATHERING19-247.VIDEO ON WEATHERING25 EARTH’S STRUCTUREThe structure of the earth is divided into four major components: the crust, the mantle, the outer core, and the inner core. Each layer has a unique chemical composition, physical state, and can impact life on Earth's surface. Movement in the mantle caused by variations in heat from the core, cause the plates to shift, which can cause earthquakes and volcanic eruptions. These natural hazards then change our landscape, and in some cases, threaten lives and property. style.visibilitystyle.rotationppt_wppt_wppt_hppt_xppt_yppt_ystyle.visibilitystyle.rotationppt_wppt_wppt_hppt_xppt_yppt_ystyle.visibilitystyle.rotationppt_wppt_wppt_hppt_xppt_yppt_y EARTHQUAKESEarthquake, any sudden shaking of the ground caused by the passage of seismic waves through Earth’s rocks. Seismic waves are produced when some form of energy stored in Earth’s crust is suddenly released, usually when masses of rock straining against one another suddenly fracture and “slip.” Earthquakes occur most often along geologic faults, narrow zones where rock masses move in relation to one another. The major fault lines of the world are located at the fringes of the huge tectonic plates that make up Earth’s crust. What happens when two blocks of the earth suddenly slip past one another. The surface where they slip is called the fault or fault plane.