Geography Flashcards
Crust
Thinnest Layer, Coldest layer, Solid rock
Mantle
Thickest layer, 1000-3700°C, Semi molten
Outer Core
2300km thick, up to 5000°C, liquidised iron
Inner Core
1250km thick, over 5000°C, Iron and nickel
Plate boundary
Where tectonic plates meet.
Ring of Fire
The ring of volcanoes in the pacific ocean.
What are the 4 pieces of evidence for the tectonic plate theory?
Jigsaw Fit, Convection Currents, Fossil Studies, Geological patterns.
Jigsaw Fit
Coastlines on many continents seem to fit together
Convectional Currents
Hot rock rises and spreads in two directions slowly moving the earth’s crust.
Fossil Studies
On the coasts of Africa and South America, there is a very rare land reptile: the mezasaurous.
Geological Patterns
The mountains of North africa and South europe consist of the exact same rocks that together make a pattern in the mountain range.
Continental Plates
Thick, old plates made of basalt
Oceanic Plates
New, thin plates made of Granite
Convergent (destructive) Plate boundary
When two plates (oceanic and continental) move towards each other, the oceanic plate to move under, causing earthquakes and composite volcanos
Divergent (constructive) Plate boundary
When two plate move away from each other, causes calm earhtquakes and volcanoes.