This occurs when a mountain range forces air to rise: frontal lifting. convergence. localized convective lifting. orographic lifting.

The easiest way of knwing the answer is trough the etymology of the words. Orographic comes from the ancient greek word oros.

Orographic lifting occurs when an air flow or air mass finds itself obligated to go over a mountain range since it cannot go trough the sides (mountain ranges are to long for that).

Hope it helped,

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climate change and pollution

the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.