Environmental Geology

Jun 30th, 2015
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- Forces inside the earth cause continents to drift, split and crash into each other (very slowly).A Layered Sphere -core: interior of the earth, composed of hot metal (mostly iron), solid center, semi fluid outer, 2,900-5,000 km in diameter.

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Environmental Geology- Forces inside the earth cause continents to drift, split and crash into each other (very slowly).A Layered Sphere-core: interior of the earth, composed of hot metal (mostly iron), solid center, semi fluid outer, 2,900-5,000 km in diameter.-Mantel: surrounds core, much less dense, high concentration of light elements (O2, Si, and Mg), 2,900 km in depth.-Crust: cool, lightweight brittle rock that floats on the mantle (oceanic crust is like the mantle but has more Si while the continents are thicker, lighter regions of crust rich in Ca, Na, K, and Al).Tectonic Processes and Shifting Continents-Tectonic Plates: large pieces of land broken and moved by huge convection currents on the upper layer of the mantle.-Magma: molten rock that gets pushed up from the mantle through cracks in the oceanic crust and piles underwater to create ocean ridges. Huge mountains and trenches are formed, greater than anything on the continents.-Earthquakes are caused by grinding and jerking as plates slide past each other.-When plates collide mountain ranges are pushed up.-When an oceanic plate collides with a continental landmass, the ocean plate will be subducted and

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