(1). air pressure can be high or low. does air flow from low to high pressure or from high to low pressure? (2). which is heavier—warm air or cold air? (3). which has higher air pressure—warm air or cold air? how do you know? (4). global circulation cells occur because of uneven heat distribution and the earth's rotation. what do we call the effect of the earth's rotation on air circulation?

Temperature also makes changes in air pressure. In cold air, the molecules are more closely packed together than in warm air, so cold air is more dense than warm air. Since warm air is less dense and creates less air pressure, it will rise; cold air is denser and creates greater air pressure, and so it will sink.

electromagnetic waves travel through space with vacuums. give me brainliest if right.

i would think it's food chain