PLATE TECTONICS

By:JeN mOoRe

CONVERGING BOUNDARIES

. 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

COLISIONAL BOUNDARIES

.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

TRANSFORM BOUNDARIES . 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

 DIVERSION BOUNDARY’S

. 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

OLD FORMATION 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 .

PLATE TECTONICS PART 1 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.

PLATE TEC. PART 2 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.

PLATE TEC. PART 3 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.)

PART 4 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.

THEORY OF PLATE TEC. 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 EARTHS SURFACES 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.

THE EARTHS SURFACES

PANGAEA In 1915, the German geologist and

meteorologist Alfred Wegener (1880-1930) 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.

THE END u r now free to applaud!