What's the word of a theory that states that earths crust and upper mantle are broken into sections which move around on a special layer of the mantle?

The Plate Tectonic theory

Explanation:

According to the theory of plate tectonics, the earth's lithosphere is comprised of numerous plates which are commonly known as tectonic plates and are mainly of two types, the continental and oceanic crust.

These plates move over a relatively less dense layer of asthenosphere where the rocks flow in response to deformation. This movement of plates is due to the formation of convection current in the mantle and this currents are formed because of the heat supplied from the interior of the earth.

This is the main driving force for the lithospheric plates to move over the layer of asthenosphere.

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explanation:

the largest database of organic compounds lists about 10 million substances, which include compounds originating from living organisms and those synthesized by chemists. the number of potential organic compounds has been estimated at 1060—an astronomically high number. the existence of so many organic molecules is a consequence of the ability of carbon atoms to form up to four strong bonds to other carbon atoms, resulting in chains and rings of many different sizes, shapes, and complexities. the simplest organic compounds contain only the elements carbon and hydrogen, and are called hydrocarbons. even though they are composed of only two types of atoms, there is a wide variety of hydrocarbons because they may consist of varying lengths of chains, branched chains, and rings of carbon atoms, or combinations of these structures. in addition, hydrocarbons may differ in the types of carbon-carbon bonds present in their molecules. many hydrocarbons are found in plants, animals, and their fossils; other hydrocarbons have been prepared in the laboratory. we use hydrocarbons every day, mainly as fuels, such as natural gas, acetylene, propane, butane, and the principal components of gasoline, diesel fuel, and heating oil. the familiar plastics polyethylene, polypropylene, and polystyrene are also hydrocarbons. we can distinguish several types of hydrocarbons by differences in the bonding between carbon atoms. this leads to differences in geometries and in the hybridization of the carbon orbitals.