Why is plate tectonics a unifying theory?
Plate tectonics refers to all the large-scale process that shape Earth's crust. Plate tectonic boundaries are regions where the edges of the lithosphere meet. There are three types of plates boundaries, namely, divergent, convergent, and transform. Each having a different manner of moving and bringing with it the effects it causes to Earth's surface.
Answer and Explanation:
Plate tectonics is a unifying theory because it brought together the theories of continental drift and seafloor spreading. It brought all the explanations concerning earthquakes, volcanoes, and existence of ocean basins and continents together.
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Learn more about this topic:
from General Studies Earth & Space Science: Help & ReviewChapter 7 / Lesson 5