Plate Tectonics

Earth Structure

The earths layers are as follows: first there is a thin curst (in comparison to the rest of the earth) composed of dried rocks and minerals, the mantle composed of molten rock, the outer core composed of liquid iron and nickel giving us our magnetic field around the earth that determines our north and south and the inner core composed of solid iron the iron is solid because of the pressure it is under but is still really hot.

  • Ionosphere – the area just above the atmosphere where the atmosphere effectively defuses into space.
  • Atmosphere – the area in which we and our air is held
  • Hemisphere – literally means either the north or south of a sphere/(our planet)

Pangaea

Pangaea or Pangea was a supercontinent that existed during the late Paleozoic and early Mesozoic eras. It formed approximately 300 million years ago and then began to break apart after about 100 million years.

Pangea was once the place where a long time ago all the countries of the world were as one-together, but moved due to tectonic plates (pieces of the earths crust) separating, colliding and sliding because of the heating and cooling of magma (lava in the earth) that circulates, these are called convection currents.

Convection Currents

These convection currents move the plates. The image below shows the fault-lines (where the edges of tectonic plates meet). These fault lines have over many changed due to the fact the when the plates separate they allow magma to surface and dry to become the earths crust creating more land thus why it’s called a constructive plate margin and when plates either collide to make mountains thus being called a collision margin or if an oceanic plate (sea-plate) and a continental plate (land plate) collide the oceanic plate is heavier so converses under the continental and heats to becomes molten rock and can create volcanoes in the earths crust thus why it’s called a destructive margin. The last plate margin where two plates slips rubs and grind in opposite directions-the friction between the plate can be released in seismic waves which are earthquakes.

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