Disasters CT 1 Flashcards
How do cows contribute to climate change?
Cows produce methane from burping, farting and excretion. Methane traps heat in our atmosphere which causes climate change because the methane is heating up our atmosphere.
What are the 4 layers of our earth and what is their characteristics? The Crust
The Crust: It is the earth’s thinnest layer, it is hard and rigid, and it is only a few miles think under the oceans and it averages 20 miles thick under the continents.
What are the 4 layers of our earth and what is their characteristics? The Mantle
The Mantle: It is a dense layer subdivided into upper and lower regions. It is made of hot and semisolid rock located directly below the crust and it is about 1,800 miles thick.
What are the 4 layers of our earth and what is their characteristics? The Outer Core
The Outer Core: It is the only liquid layer of the earth, it is made up of mostly iron and nickel. It is located about 2000 miles below the surface.
What are the 4 layers of our earth and what is their characteristics? The Inner Core
The Inner Core: It is the innermost layer, it is extremely hot and solid. It is composed of mostly iron and nickel.
What are the 2 theories of plate movement? Convection Current
Convection Current: There are convection currents within the mantle. They are caused by the heat from radioactive decay in the core.
What are the 2 theories of plate movement? Slab pull and Ridge Push
Slab pull: As the crust starts to subduct it keeps going under due to gravity. Ridge Push: Where the crust has been pushed up it flows down due to gravity.
What was the problem with the Convection Currents theory?
There was a problem with the convection currents theory and it was that some plates where moving faster than the convection currents that they are floating on.
What are the 4 plate boundries? What do they look like? What natural hazards do they produce and why? Destructive
Destructive Plate Margins: They occur when and oceanic crust meets a continental crust.
What are the 4 plate boundries? What do they look like? What natural hazards do they produce and why? Constructive
Constructive Plate Margins: Most commonly where two plates move apart.
What are the 4 plate boundries? What do they look like? What natural hazards do they produce and why? Conservative
Conservative Plate Margins: Plates move relative to each other, but a crust is neither made or destroyed.
What are the 4 plate boundries? What do they look like? What natural hazards do they produce and why? Collision
Collision Plate Margins: Where two continental plates colide.
