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The Earth´s internal energy
Transcript of The Earth´s internal energy
: The internal heat of the Earth (geothermal energy) is produced when radioactive elements (uranium, thorium, potassium)
Plate tectonics theory
Lithosphere is divided into pieces called TECTONIC PLATES
Movement of the continents: Continental Drift
This heat produces GEOLOGICAL PROCESSES:
- MOUNTAIN RANGES
- ROCK´S FORMATION AND DEFORMATION
: thin layer. Solid Rock. 70 km
2. MANTLE: molten rock or magma
upper mantle (700km)
lower mantle (3000km)
3. CORE: (6000 km) Nickel and Iron
Inner: Solid- due to the high pressure rocks cannot melt
Heat and pressure increase
: Crust + upper mantle that behaves elastically
: Just below the lithosphere, it is involved in the movement of the plates
Types of crust
: we can differentiate two types of crust:
CONTINENTAL CRUST: mainly made of granite, thick and low density. It is emerged crust, and it has the continents over it.
OCEANIC CRUST: Mainly made of basalt, thinner and denser than the continental crust. It is submerge crust
We distinguish mountain ranges and plains
- Rift valley
- Oceanic ridge
- Oceanic trench
The places where the plates meet are called
plates move away from each other (Diverge). Magma rises and fill the space between the plates. New crust is formed
Two plates move alongside each other. Crust is conserve
Two plates move towards each other (Converge). One slides under the other (subduction). Crust is destroyed and finally folded
Type of plate boundaries
Movement of the plates
This plates move by convection currents!
How does the ocean floor look like??