By:JeN mOoRe

. Also known as subduction boundary .occurs when 2 plates r under each other and are pushed together . If there is land on the sides of the plates the ocean plate will subduct,  Or slide under that plate

.occurs when land masses and two plates are pushed together . the land masses buckle and fold because they are trying to reside in the same space . when the buckle and fold they create mountain ranges and hills

. occurs when to plates slide into each other . the plates to not slide smoothly the slide with tension and power .when this movement happens it creates a earth quake

. also known as spreading a boundary .occurs when to plates r moved apart .it allows magma or molten rock to slide in and fill the gap in the plates .The two plates move away from each other

 when the earth was younger we had many different formations for instance:  Africa was right next to south American  north American and Europe where close but very little distance  Antarctica hit the tip of Africa  Australia was next to Antarctica  it was like a small space of adaption but all continents fit together like puzzle peaces.

 The Earth's rocky outer crust was created billions of years ago after the Earth formed. The crust is not a solid shell. it is broken up into big and large plates that sit on top of the soft and smooth under mantle.

 The plates are made of rock and go all over the globe. They move both sideways and up and down. Over long periods of time the plates also change in size as their edges are added to, crushed, or pushed into the earth’s mantle. These plates are from 50 to 250 miles (80 to 400 km) thick.

 The placement of Earth is always changing not only are the underlying plates moving but the plates change in size. Also, the sea level changes over time (as the temperature on Earth varies and the poles melt or freeze to varied extents.)

 The present continental and oceanic plates include: the Eurasian plate, Australian-Indian plate, Philippine plate, Pacific plate, Juen de Fuac plate, Naza plate, Coocos plate, North American plate, Caribbean plate, South American plate, African plate, Arabia plate, the Antarctic plate, and the Scotie plate. These plates consist of smaller sub-plates.

 The theory of plate tectonics was developed in the 1960's. The theory explains the movement of the Earth's plates and also explains the cause of earthquakes, volcanoes, oceanic trenches, mountain range formation, and many other things in our lives.

 The top layer of the Earth's surface is called the crust. Oceanic crust is thinner and denser than continental crust. Crust is being created and destroyed. oceanic crust is more active than continental crust.  Under the crust is the rocky mantle, which is made of of silicon, oxygen, magnesium, iron, aluminum, and calcium. The upper mantle is rocky and is part of the lithosphere.The lower mantle flows slowly, at a rate of a few centimeters per year. The asthenosphere is a part of the upper mantle that exhibits plastic properties.

 In 1915, the German geologist and meteorologist Alfred Wegener ( ) first made the theory of continental drift, which says that parts of the Earth's crust slowly drift atop a liquid core. The fossil record supports and gives credit to the theories of continental drift and plate tectonics.

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