Tectonic Hazards
- Created by: Frmo42069
- Created on: 10-11-20 10:40
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- Tectonic Hazards
- Earth Structure
- Crust
- oceanic
- 5-10km thick
- oldest rock is 200 million years
- basalt
- Ocean
- Continental
- 30-90km thick
- Granite
- Ocean
- Oldest rock is 4 billion years
- oceanic
- Crust
- Plate Movement
- Convection currents
- circular movements of heat in the mantle
- generated by radioactive decay in the core
- Dont move plates
- Slab-Pull Theory
- A theory that outlines how large and dense sinking into the mantle at ocean trenches drives tectonic plate movement
- Convection currents
- Plate Margins
- Destructive
- Subduction
- oceanic crust goes under continental crust
- Plates Meet
- Collision
- continental plates collide and rise upwards.
- can form volcanoes
- Subduction
- Constructive
- 2 oceanic plates move away from eachother
- can form rift valley
- Conservative
- two plates move past eachother
- can form earthquakes
- Destructive
- Types of Volcanoes
- Composite
- Forms tall peaks
- many layers of lava
- pumice
- ash
- tephra
- aka stratavolcano
- Shield
- composed almost entirely of fluid lava
- Lay low on ground
- Composite
- Hazards
- Volcano
- Formed by collision of two plates
- contains magma that has risen up from beneath the earths crust
- Earthquake
- Formed by two plates moving
- cause mass shacking of ground
- Volcano
- Earth Structure
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