Chapter+Two+Terms

= Hydrosphere -Oceans, lakes and rivers and other bodies of water make up part of the earth. = = i swim in the hydrosphere in the summer. = = Lithosphere- land makes part of the earth. = = USA is a lithosphere cause its a big mass of land. = = Biosphere- the part of the earth where life exsist. = = the whole world is a biosphere. = = Continental Shelf - an underwater extension of the coast plain. = = florida has a long continetnal shelf underwater. = = Mariana Trench- a narrow, underwater canyon about 35,827 feet deep. = = i can sky dive in the Mariana Trench. = = Mantle - next to the outer core is a thick layer of hot dense rock. = = no one can go near the mantle core ! = Lydia Grommish: __Continental Drift__- The theory that the continents were once joined and then slowly drifted apart. Continental drift is most often used in plate tectonics. __Plate Tectonics__- Refers to all of the physical processes that create many of the Earth’s physical features. Most times plate tectonics are used in relation to continental drift. __Magma__- It is molten rock. Magma can be found in the mantle and the pushed up during plate tectonics. __Subduction__- When heavier sea plates dive beneath the lighter continental plates. Subduction made the Andes Mountains. __Accretion__- When pieces of the earth’s crust come together slowly as the sea plat slides under the continental plate. Accretion levels off seamounts, underwater mountains, and piles up the resulting debris into trenches. __Spreading__- When sea plate move apart. The rift from spreading allows magma to well up between the plates and cause undersea volcanic mountains, ridges, and islands.


 * Folds- or bend rocks, in the layer of rocks. the folds causes earthquakes at times. **
 * Faults- cracks in the earths crust. the biggest fault is in Africa. **
 * Ring of fire- is a place around the california coast and japan and china where fires are most possible. the ring of fire is between japan and earth **
 * Weathering- is where rocks are broken down by weather and natural diasters. weathering is one of the most reasons that the earth is getting damaged. **
 * Erosion- wears away the earths surface by winds, glaciers, and moving water. the water erosioneds rocks down the river. **
 * Glaciers- or large bodies of ice that move across the earths surface. there are only few glacies left in the world left. **