Download PlAtE tEcToNiCs - NagelBeelmanScience

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 (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.
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