INTERNAL ENERGY OF THE EARTH
internal heat Earth comes from several sources:
- the impact of various stellar bodies colliding with the planet during the training process.
- From the decay of radioactive elements such as thorium, uranium and potassium.
- The movement of continents.
- Volcanoes.
- Earthquakes.
- The origin of mountain ranges and ridges.
- The formation of some types of rocks and their deformation.
CONTINENTS
Alfred Wegener suggested in the early twentieth century that the continents moved.
This provided different types of tests :
- Geographic: some continents fit together with other, like pieces of a puzzle. This is because 250 million years ago they were together. Locate the continents 250 ma ago
- Weather: We observed that some continents millions of years ago had very different climates than today. A plausible explanation would be that they were located in a different position at present. Paleontological
- : In South America and Africa fossils are the same, while their current faunas are very different. The most likely explanation is that the continents were together. In the attached image shows the distribution of various agencies during the secondary era. The distribution had explained when one considers that the continents were united.
the Plate Tectonics Tectonic plates are pieces of lithosphere that floats on the mantle. The plates are moved by convection currents that occur in the mantle.
FOR FURTHER.
As you can see on the map, there are different types of plate boundaries:
- Those where the plates move apart. Usually found under the ocean floor and form the ridges also causing volcanoes and earthquakes. In these contacts the lithosphere is formed.
- Those in the plates collide. They often form mountain ranges and earthquakes and volcanoes. The collision may occur between oceanic plates, or between continental and oceanic plates and continental plates entrte. In the case of oceanic plates collide, the oceanic plate is inserted under the other. Process called subduction.
- Finally plates moving parallel to one another in which neither produced nor destroyed the lithosphere.
More on Plate Tectonics
VOLCANOES
materials resulting in a volcano can be solid (called pyroclastic), liquids (lava) and gases.
LAVA ERUPTION OF FLUID IN HAWAII Kilauea volcano
LAVA ERUPTION OF VISCOSE AND MATERIAL PIROCLÁSITCO IN ETNA VOLCANO.
MORE ON VOLCANOES EARTHQUAKES
are intense vibrations that occur Earth resulting in the displacement of large masses of materials caused by faults, offset plates, sliding materials. In an earthquake can be distinguished: the hypocenter, the epicenter and the seismic waves that can be superficial or internal.
SOBFRE MORE EARTHQUAKES
THEME SELF
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