Answer:
The earth's crust is comprised of lithospheric plates and they are divided into the continental crust (plates) and the oceanic crust (plates). These plates are constantly in motion over the Asthenosphere layer. This motion takes place due to the convection current that initiates in the mantle. This initiation of convection current is because of the heat radiated from the core of the earth. This plate motion takes place in three different ways, such as-
(a) Divergent plate motion
(b) Convergent plate motion
(c) Transform plate motion
In a divergent plate motion, the two plates move in the opposite direction. As a result of which the hot, less dense magma rises up and comes out towards the surface. This magma originates from the deeper mantle due to the convection current.
Hence, the convection current is the main mechanism behind the plate motion.
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The Dam even though has a lot of advantages, has disadvantages as well, most noticeably it causes a lot of landslides, flooding's, changes whole ecosystems and endangers the lives of the millions of people living on the banks of the Yangtze River and every year there's a lot of casualties unfortunately.
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