Which of the following relationships is/are CORRECT for gases? 1. The amount of a gas (in moles) is inversely proportional to its volume (at constant temperature and pressure). 2. The volume of a gas is directly proportional to its temperature in kelvin (at constant pressure and moles). 3. The pressure of a gas is inversely proportional to its temperature in kelvin (at constant volume and moles).

in cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. a contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes.

explanation:

acid rain does not usually kill trees directly. instead, it is more likely to weaken the trees by damaging their leaves, limiting the nutrients available to them, or poisoning them with toxic substances slowly released from the soil. the main atmospheric pollutants that affect trees are nitrates and sulphates.