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They are located at oceanic and continental mid-rift. The volcanic activity causes the formation of new oceanic crust, the widening of the ocean floor and the progressive separation of adjacent boards.
Pale climate evidenceIn the sixties, coal moraines were found, showing evidence of an ancient forest.
Earth is a very dynamic planet. Its surface is subject to continuous change such as rebuild internal forces and broken continents, which cause the formation of oceans and mountains
His discovering was based on:
Geographic evidencethe shape of the coasts and platforms of the continents match.
Geological evidencediscovered there were mountain ranges with the same age and same kind of rockson in different continents
Paleontological evidenceIn different continents separated by oceans, fossils of the same species were found; some of them were land fossils like reptiles and plants, so it’s impossible for them to have crossed the ocean.
Alfred Wegener found out that the continents were moving on the ocean floor.
The edges construction or expansion zones:
Edges destructive or subduction zones:
Collision places between oceanic and continental plates, so the oceanic crust sinks beneath the continental causing earthquakes and volcanism in mountain ranges, like, for example, the Andes. If the collision occurs between two oceanic plates, it forms island arcs and deep-sealarge pits.
Horizontal movement parallel to the plate boundary, resulting in a brush that generates earthquakes. Examples of the San Andreas fault in California.
Approaching of two continental formations cause a strong collision, whose consequences are the folding of sediments accumulated between both, as well as deformations of its boundaries. For example, the formation of the Himalayas
The collision zones
The edges liabilities or transform faults