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Answer:Tectonic plates, large slabs of rock that divide Earth's crust, move constantly to reshape the Earth's landscape. The system of ideas behind plate tectonics theory suggests that Earth's outer shell (lithosphere) is divided into several plates that glide over the Earth's rocky inner layer above the soft core (mantle).
Explanation: mantle
The basis for this could be that the lithosphere is divided into a number of units. These are called plates and they move with respect to each other causing a number of observable geological phenomena.
What is plate tectonics?
It is a scientific theory to explain the creation of major landforms on earth. It was proposed that this was a result of Earth’s subterranean movements.
The theory was further studied and was widely accepted in the 1960s. This completely transformed the study of earth sciences as it explained many phenomena. Some of them were volcanoes, mountain-building events, and earthquakes.
According to this theory, the outermost layer of the earth is the lithosphere. It is made up of the crust and the upper mantle. This is thought to be is broken into large rocky plates.
These broken plates are present on top of a layer of rock which is a partially molten layer and is called the asthenosphere.
The plates are moving relative to each other because of the convection of the asthenosphere and lithosphere, at different rates. These rates range from two to 15 centimetres (one to six inches) per year.
Therefore the presence of plates is described by the theory of plate tectonics.
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