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In general, chemical reactions combine in definite ratios of chemicals. The boundary between the crust and dating is conventionally placed at the Mohorovi?
Some of these less dense rocks, such as granite, are common in the continental crust but rare to absent in the oceanic crust. The chemical composition of a mixture can be defined as the distribution of the single substances that constitute the mixture, called "components".
There is no evidence of plate tectonics. For example, the number of atoms of a given element X on the reactant side must equal the number of atoms of that element on the product side, whether or not all of those atoms are actually involved in a reaction.
In contrast, the bulk of the continental crust is much older. The upper part of the mantle is composed mostly of peridotite, a rock denser than rocks common in the alpha dating profile crust.
Stoichiometry rests upon the very basic laws that help to understand it better, i. A theoretical protoplanet named "Theia" is thought to have collided with the forming Earth, and part of the material ejected into space by the collision accreted to form the Moon.
The cumulate rocks form much of the crust. Crust on the far side of the Moon averages about 12 km thicker than that on the near side.
The primordial crust was very thin and was probably recycled by much more vigorous plate tectonics and destroyed by significant asteroid impacts, which were much more common in the early stages of the solar system.
This is necessarily less than the number of chemical components, since each reaction manifests a relation between at least two chemicals. The convention is to assign negative coefficients to reactants which are consumed and positive ones to products.