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The Earth´s internal energy

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by

Blanca Toledo

on 21 October 2016

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Transcript of The Earth´s internal energy

The Earth´s internal energy
Earth´s energy
Origin
: The internal heat of the Earth (geothermal energy) is produced when radioactive elements (uranium, thorium, potassium)
breaks up
Plate tectonics theory
Lithosphere is divided into pieces called TECTONIC PLATES

Movement of the continents: Continental Drift
EARTH´S STRUCTURE
This heat produces GEOLOGICAL PROCESSES:
- VOLCANOES
- EARTHQUAKES
- MOUNTAIN RANGES
- ROCK´S FORMATION AND DEFORMATION
1.
CRUST
: 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
Outer: Liquid
Inner: Solid- due to the high pressure rocks cannot melt
Heat and pressure increase
Lithosphere
: Crust + upper mantle that behaves elastically

Asthenosphere
: 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
Earth´s relief:

Continental relief:
We distinguish mountain ranges and plains
Oceanic Relief:
- Rift valley
- Oceanic ridge
- Plains
- Oceanic trench
The places where the plates meet are called
PLATE BOUNDARIES
or
PLATE MARGINS
Constructive margin:
plates move away from each other (Diverge). Magma rises and fill the space between the plates. New crust is formed
Conservative margin:
Two plates move alongside each other. Crust is conserve
Destructive margin:
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??
Full transcript