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4248191
restless Earth
Description
introduction into the topic restless earth
No tags specified
plate boundaries
continental drift
structure of the earth
techtonic plates
Mind Map by
chapel.jacquesel
, updated more than 1 year ago
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Created by
chapel.jacquesel
over 8 years ago
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Resource summary
restless Earth
Structure of the world
Inner core= solid Iron + Nickel. 15,000 degrees
Outer core= liquid layer Nickel + Iron
Mantle= semi molten rock. 4000 degrees. The thickest layer- makes up half the earth- about 2900 Km thick
crust= solid, made up of plates- thinnest layer- about 20 Km
Continental drift
Evidence
Plates fit together. Africa+ south America
Matching fossils different continents
Wegener
Pangaea
Continents were joined together
Explanation
molten rock heated by earths core
rises towards crust
cools sinks back down again
process= convection current
plates floating on mantle
convection currents in liquid mantle
Drag floating plates as they circulate
Plate boundaries
constructive
Formations
shield volcanoe
Earthquakes
2 plates move apart. magma fills the gap
conservative
formations
Earthquake
plates scrape past each other travelling opposite directions/same direction different speeds
Destructive
oceanic +continental plate collide. Oceanic plate sub ducted under continental plate
formations
composite volcanoes
ocean trenches
earthquakes
types of plate
Oceanic
Heavy
Less thick
dense
Continental
thicker
light not dense
Media attachments
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