Plate tectonics test

3 layers of the earth and their state

Core, solid

Exosphere, gas

Crust, liquid

Mantle, liquid

Crust, solid

Mantle, solid

Core, liquid

Stratosphere, solid

Thermosphere, liquid

Thermosphere,solid

5 layers of earth

Inner core, A dense sphere of solid iron and nickel at the center of Earth

Inner core, A layer of molten iron and nickel that surrounds the inner core of Earth

Outer core, the rigid outer part of the earth, consisting of the crust and upper mantle.

Outer core, A layer of molten iron and nickel that surrounds the inner core of Earth

Lithosphere, the rigid outer part of the earth, consisting of the crust and upper mantle.

Lithosphere, The strong, lower part of the mantle between the asthenosphere and the outer core

Asthenosphere, The soft layer of the mantle on which the lithosphere floats.

Asthenosphere, the rigid outer part of the earth, consisting of the crust and upper mantle.

Mesosphere, A dense sphere of solid iron and nickel at the center of Earth

Mesosphere, The strong, lower part of the mantle between the asthenosphere and the outer core

Why does the earth have layers

Electric field of the sun

Density

Velocity

IMFS

What is refracted by the liquid outer core

P waves

S waves

Both

What is refracted by the solid inner core

P waves

S waves

Both

What type of rock is the crust mostly composed of

Igneous

Metamorphic

Sedimentary

The moho discontinuity is where

Waves speed up due to higher density

The waves turn around due to higher density

Waves slow down due to higher density

Intrusive rocks

Cool above surface, small crystals

Cool below surface, big crystals

High silica rocks are

Light colored, less dense, granite

Dark, dense, basalt and dunite

Oceanic crust is

Made of basalt, high density

Made of granite, low density

Archimedes principle is

Fb= Afdisp

Fb = Mfdisp

Crust floats on mantle due to

Density

Opposite polarities

Why is the earth bimodal

Water eroded the middle

Two densities of plates

Hot rising mantle produces

Divergent

Continental

There are volcanoes because

The crust melts and rises

Water lowers melting point and then rises

Marie tharp and bruce heezen

Sea floor spreading

First map of oceans/continents

Alfred wegener discovered sea floor spreading

True

False-theory of continents that move

Fred vine discovered sea floor spreading

True

False

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