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Plate Movements
Created May 9, 2021 1230 AM
Tags
Earth's Layers
→ Crust - outermost and thinniest
layer.
types:
Continental (thick, low-
density); and
Oceanic (thin, high-density)
→ Mantle - between the Crust and
core
→ Core - made of Ni-Fe alloys. Outer
Liquid core and Inner solid core)
Internal Structure of the Earth
Lithosphere - solid, rigid, and elastic layer (upper mantle and crust)
Asthenosphere - highly viscous, high P and high T.
Lithosphere
7 major plates: Some minor plates:
African Caribbean
Antartic Scotia
Eurasian Arabian
Plate Movements 1
, Indo-Australian Indian
North American Philippine
Pacific Juan de Fuca
South American Cocos
Nazca
Characteristics of a plate:
Can carry both continental and
oceanic crusts.
Floats on asthenosphere and
slides horizontally over it or bends
slightly.
Moves at a very slow rate.
Theories that Explain Plate Movements
Continental Drift Theory
Alfred Wegener 1915
the earth was once made of a
supercontinent called
Pangaea.
slowly drifted away and broke
into smaller pieces. 225200
mya)
2. Seafloor Spreading Theory
Harry Hess 1920 Subduction zones
Hot and less dense material where volcanoes and deep
from the mantle rises to the trenches are formed.
surface along the mid-ocean
Plate Movements 2
Plate Movements
Created May 9, 2021 1230 AM
Tags
Earth's Layers
→ Crust - outermost and thinniest
layer.
types:
Continental (thick, low-
density); and
Oceanic (thin, high-density)
→ Mantle - between the Crust and
core
→ Core - made of Ni-Fe alloys. Outer
Liquid core and Inner solid core)
Internal Structure of the Earth
Lithosphere - solid, rigid, and elastic layer (upper mantle and crust)
Asthenosphere - highly viscous, high P and high T.
Lithosphere
7 major plates: Some minor plates:
African Caribbean
Antartic Scotia
Eurasian Arabian
Plate Movements 1
, Indo-Australian Indian
North American Philippine
Pacific Juan de Fuca
South American Cocos
Nazca
Characteristics of a plate:
Can carry both continental and
oceanic crusts.
Floats on asthenosphere and
slides horizontally over it or bends
slightly.
Moves at a very slow rate.
Theories that Explain Plate Movements
Continental Drift Theory
Alfred Wegener 1915
the earth was once made of a
supercontinent called
Pangaea.
slowly drifted away and broke
into smaller pieces. 225200
mya)
2. Seafloor Spreading Theory
Harry Hess 1920 Subduction zones
Hot and less dense material where volcanoes and deep
from the mantle rises to the trenches are formed.
surface along the mid-ocean
Plate Movements 2
