8 th grade earth science
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8 th Grade Earth Science. Name Date. The Earth is Made of 5 Physical Parts. Lithosphere Asthenosphere Mesosphere Outer Core Inner Core. Lithosphere. The cool, outermost layer of the earth. The Lithosphere consists of: Crust Rigid, uppermost part of the mantle.

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8 th Grade Earth Science

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8 th grade earth science

8th Grade Earth Science

Name

Date


The earth is made of 5 physical parts

The Earth is Made of 5 Physical Parts

  • Lithosphere

  • Asthenosphere

  • Mesosphere

  • Outer Core

  • Inner Core


Lithosphere

Lithosphere

  • The cool, outermost layer of the earth.

  • The Lithosphere consists of:

    • Crust

    • Rigid, uppermost part of the mantle.

  • The Lithosphere is divided into 2 huge pieces called Tectonic Plates.


Asthenosphere

Asthenosphere

  • The solid, soft layer of the mantle below the lithosphere.

  • The Asthenosphere is made up of mantle rock that flows very slowly, allowing the tectonic plates to move on top of it.


Mesosphere

Mesosphere

  • Middle Sphere

  • The Mesosphere is the solid lower part of the mantle below the asthenoshpere.


Outer inner core

Outer & Inner Core

  • Outer Core

    • The outer shell of the Earth’s core

    • It is made of liquid iron and nickel.

  • Inner Core

    • A sphere of solid iron and nickel.


Plate tectonics

Plate Tectonics

  • Plate Tectonics is the theory that the lithosphere is divided into tectonic plates that move around on top of the Asthenosphere.

  • There are 3 types of Tectonic Plate Boundaries:

    • Convergent

    • Divergent

    • Transform


Convergent boundary

Convergent Boundary

  • The boundary that is created when two tectonic plates collide.

  • There are 3 types of Convergent Boundaries:

    • Continental/Continental

    • Continental/Oceanic

    • Oceanic/Oceanic


Continental continental

Continental/Continental

  • When two tectonic plates with continental crust collide, they buckle and thicken, pushing the continental crust upward.


Continental oceanic

Continental/Oceanic

  • When a tectonic plate with continental crust crashes into a tectonic plate with oceanic crust, the oceanic plate slides under the continental plate.

  • The region where oceanic lithosphere sinks into Asthenosphere is called a subduction zone.


Oceanic oceanic

Oceanic/Oceanic

  • When two oceanic plates collide, one of the oceanic plates is subducted, or sinks, under the other.


Divergent boundary

Divergent Boundary

  • The boundary that is created when two tectonic plates separate.

    • Also called rift zones.

  • As the two tectonic plates move apart, magma rises to fill the gap.

    • At a mid-ocean ridge, the rising magma cools to form new oceanic lithosphere.


Transform boundary

Transform Boundary

  • The boundary that is created when two tectonic plates slide past each other horizontally.

    • As the two tectonic plates slide past one another, they are not smooth, they grind and jerk as they slide, producing earthquakes.


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