Plate Tectonics. Structure of Earth (16a). The Earth is divided into 3 main layers As you travel deeper through the layers of the Earth, the: Temperature Increases Pressure Increases Density Increases. Structure of Earth (16a). Crust – The outermost layer of the Earth.
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It is between 5 to 100 km thick.
It is the thinnest layer of the Earth.
There are two types of crust.
Oceanic crust – thinner, more dense, mostly made of basalt
Continental crust – thicker, less dense, mostly made of granite
Temperatures range between 0 to 1000ᵒ C
It is thicker than the crust.
It contains most of the Earth’s mass.
It is 2,900 km thick.
Temperatures range between 1,000 to 3,700ᵒ C.
It is divided into 2 layers: inner core and outer core.
It is made mostly of iron and nickel.
It has a radius of 3,430 km
Temperatures can range from 3,700 to 7,000ᵒ C.
Convergent – move toward each other
Divergent – move away from each other
Transform – slide past each other
Compression- when an object is squeezed at a convergent boundary.
Tension - when forces act to stretch an object at a divergent boundary.
Shearing – when forces slide past each other at a transform boundary.
Normal Fault – Form where rocks are pulled apart because of tension at divergent boundaries.
Reverse Fault – Form where rocks are pushed together by compression at convergent boundaries.
Strike-Slip Fault – Form where rocks slide past each other horizontally by opposing forces at transform boundaries.