The deformation in single crystal typically occurs along closely packed planes or planes with
a) maximum atomic densityb) minimum atomic density
c) average atomic densityd) any level of atomic density

a) maximum atomic density

Explanation:

Crystalline structures in the form of closed planes have a high atomic density so the atoms are very close to each other. Therefore, the force required to move the dislocations in the application of the external tension, which acts as the shear force resolved, in a closed plane is relatively small and, therefore, the displacement can move with relative ease compared to that of the atomic planes. where atoms are widely spaced and, therefore, have low atomic density.

a rain shadow is a dry region of land on the side that is protected against the prevailing winds of a mountain range. the prevailing winds are the winds that occur most of the time in a particular place of the earth

prevailing winds carry air toward the mountain range. as the air rises up over a mountain range, the air cools, water vapor condenses, and clouds form. on this side of the mountains, called the windward side, precipitation falls in the form of  rain  or snow. this dry air produces a  rain shadow.