Download PLATE TECTONICS He thought that continents were an only piece

PLATE TECTONICS 
He thought that continents were an only piece of land but then they were separated, because he didn’t
prove why continents were separated. They were Arthur Holmes and Harry Hess. Their evidence
was that thermal convection in the earth’s mantle could cause continents to move, but they
suggested that the continents didn’t move but were “carried” by larger pieces of the earth’s
crust called tectonic plates. And it let to the development of plate tectonics. There are three
different types of plate boundaries:
• Divergent boundaries: where new crust is generated as the plates pull away from each
other.
• Convergent boundaries: where crust is destroyed as one plate dives under another.
• Transform boundaries: where crust is neither produced nor destroyed as the plates slide
horizontally past each other.
• Divergent boundaries: the oceanic Nazca Plate and the South American Plate.
• Convergent boundaries: the Indian and Eurasian plates.
• Transform boundaries: the Pacific Plate and the North American Plate.
The three different types of convergent plate boundaries are: divergent boundaries,
convergent boundaries and transform boundaries.
• Divergent boundaries: the Mid-Atlantic Ridge (from the Arctic Ocean to beyond the
Southern tip of Africa).
• Convergent boundaries:
- Oceanic-continental convergence: the coast of South America along the Peru-Chile trench.
- Oceanic-oceanic convergence: the Marianas Trench.
- Continental-continental convergence: in Asia (Himalaya).
• Transform boundaries: the San Andreas Fault zone in California, that it connects the
East Pacific Rise with the South Gord. Plate tectonic and ocean trenches have in
common the process that takes place at convergent boundaries by which one tectonic
plate moves under another tectonic plate called subduction. Over 4.6 billion years and
it’s because the age of the formation of the Earth and the age of the rocks are the same.
A Convection current is the internal movement of the flow of hot fluid in a circular
motion caused by heating and cooling. There are two main sources of heat inside the
Earth: radioactive decay and residual heat. (sites.google.com/site/victorsandraproject/)