The theory of plate tectonics states that Earth's lithosphere is divided into several large plates that float on the semi-fluid asthenosphere beneath them. These plates are in constant motion, moving either towards each other (convergent boundaries), apart from each other (divergent boundaries), or past each other (transform boundaries), causing earthquakes, volcanic activity, and the formation of various geologic features. This theory helps explain the distribution of earthquakes, mountain ranges, and ocean basins on Earth's surface.
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The three lines of evidence for Plate Tectonics are: 1) the distribution of earthquakes and volcanoes along plate boundaries, 2) the matching shapes of continents on opposite sides of the Atlantic Ocean, known as continental drift, and 3) the patterns of magnetic striping on the ocean floor that provide evidence of seafloor spreading.
The theory of plate tectonics replaced the older theory of continental drift. It provided a more comprehensive explanation for the movement of Earth's lithospheric plates and the processes that shape our planet's surface.
The theory that states that plates move around on the asthenosphere is called plate tectonics. This theory explains the movement of the Earth's lithosphere into different plates and their interactions at plate boundaries due to the convective currents in the asthenosphere beneath them.
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The theory of plate tectonics states that pieces of the Earth's lithosphere, called tectonic plates, are in constant slow motion, driven by processes such as seafloor spreading, subduction, and continental drift. These movements can result in events like earthquakes, volcanic eruptions, and mountain formation.