Topic 1: Tectonic Processes & Hazards (Edexcel A-Level Geography): Flashcards
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Name the two types of Earth's crust
Name the two types of Earth's crust
Oceanic (basalt, high density) & Continental (granite, low density)
Temp. at base of crust
Temp. at base of crust
400°C
Inner core temperature
Inner core temperature
7000°C
% of iron in outer core
% of iron in outer core
88%
What drives mantle convection currents
What drives mantle convection currents
Heat from Earth's core
How mantle material behaves
How mantle material behaves
Like a viscous liquid
How often Earth's magnetic field direction changes
How often Earth's magnetic field direction changes
Every 100,000 years
Which plate subducts at destructive boundaries
Which plate subducts at destructive boundaries
Denser oceanic plate subducts under less dense continental plate
What is the Benioff zone
What is the Benioff zone
Area of seismicity where slab is thrust down in subduction zone
Where seafloor spreading occurs
Where seafloor spreading occurs
At divergent boundaries under oceans