Plate Tectonics

Joel Velasco 1/22/15 6th period


Alfred Wagner saw that the west coast of Africa and the east coast of S.A. fit together like pieces of a puzzle.


People didn't believe Wegener because it was something new that they didn't think was possible.


Two scientists that supported Wegener were Alexander Du Toit, whose evidence was the similarity of the fossils of Africa & South America, and Emile Argand, whose evidence was the folded and buckled strata in the Swiss Alps.


Divergent, Convergent, and Transform.


Plates separating=Trenches/faults,earthquake Plates colliding=Volcanoes,Mountains and earthquakes Plates sliding against each other=Faults,canyons,and earthquakes.


The west coast of United States.


The both have the convergent process.


The rocks off the East coast of North America are very old compared to the rocks along the Mid-Atlantic ridge.


This is because the sea floor is spreading where oceanic plates are separating.


Convection currents are heat currents from the mantle that go in a circular motion that is caused by heating and cooling.


The North America, Eurasian, Indo-Australian, Pacific, Antarctic, South America, and African Plates


Two negative events that happen as a direct result of plate tectonics are volcanic eruptions and earthquakes.


These events happened at a convergent boundary.


Three good things that happen because of plate tectonics are fertile soil, ore deposits, and fossil fuels.


Fertile soils happen because of weathering of igneous rocks. Ore deposits happen when, during an volcanic eruption instead of magma coming out & reaching the surface, it slowly cools underneath the volcano and forms into crystalline rock. Fossil fuels are small pockets of gas & liquid petroleum that are formed from decomposed organic material that are transformed by heat & pressure at depth.