How would you determine the proper number of significant figures of a liquid using a graduated cylinder

Usually you can only go one more than the cylinders markings. So, for example, if your cylinder has markings of 1 mL , then at most you can say like the liquid is at 20.5 mL. Which would be 3 figures for this.

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.