Chapter 8 Science
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PRESENTATION OUTLINE
THE EARTH HAS SEVERAL LAYERS
THE LAYERS ARE THE MANTLE,CRUST,CORE, ASTHENOSPHERE,AND LITHOSPHERE.
The inner core and outer core are very much alike the inner core has not been studied but the outer core has been. The outer core is is liquid and the inner core is solid metals.
The mantle,crust,lithosphere,and asthenosphere are very alike because they are all either made of the crust or are close to the crust.
Tectonic plates might have formed in Earth's early history, they fit together like a jigsaw puzzle tectonic plates form both continental crush and oceanic crust. Africa is about half the size of its plate.
CONTENENTS CHANGE POSITION OVER TIME
In 1920 a hypothesis called continental drift, it meant that people are thought that the continents drifted apart. Pangea is part of continental drift because about 200 million years ago the continents split apart. Mid-ocean ridges are the smoothest land one can get under water.
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The causes of a plate movement is a convection that means that a transfer of energy by the movement of materiel. A convection current is a motion that transfers heat and energy in a material.
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The theory of tectonic plates is that the Earth's lithosphere is made up of plate tectonics.
Photo by Martin Lopatka
PLATES MOVE APART
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A divergent boundary occurs where plates move apart; most divergent boundaries are found in oceans. A convergent boundary is when plates push together. A transform boundary occurs when plates push toward each other.
Photo by Ben Andreas Harding
A Rift Valley is when hot material rises to build new crust. Earth's magnetic poles sometimes switch places this is called a magnetic reversal. The theory of tectonic plates is that the lithosphere is bade up of huge plates that shift a little every year.
Photo by Ninara
Subduction is a process when something is lead under another. Continental-continental subduction is when two continents collided to form a mountain. Oceanic-oceanic subduction is when an oceanic plate sinks under another. Oceanic-continental subduction is when continental crust goes under an oceanic one.
Photo by pennstatenews
