Respuesta :
Plate Tectonics is the study of the movement and changes in the rocks that make up the earth's crust. Isostasy is the equilibrium in the earth's crust maintained by a flow of rock material in the asthenosphere.
- The concept behind pre-continental drift was that in addition to the pressure of contraction, isostatic adjustments also caused the crust's heavier portions to sink and its lighter portions to rise.
- It was believed that the Earth's interior was a viscous fluid that could support this rising and sinking.
- Wegener put up the theory that continents can move in 1915 based on fossil data, how coasts appeared to fit together, and other traits, but it was not well received at the time.
- He noticed that rock ages, and mountain belts match up across the boundaries of continents if you put the continents back together as the "jigsaw puzzle fit" proposes.
- On continents that are currently divided by water, fossils of identical terrestrial flora and animals have been discovered.
- New data from the ocean floor, including topography and rock magnetism, played a major role in the development of plate tectonic theory in the 1960s.
- On the basis of symmetrical patterns, seafloor spreading was hypothesized as a mechanism to propel the migration of the continents.
Hence this led to scientists understanding of the earth's crust has changed.
learn more about Plate tectonics here: https://brainly.com/question/2325633
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