GEOLOGY

Detailed explanation-1: -Greater activity of the heated molecules increases the spacing between neighboring molecules and thus reduces air density. The decreasing air density then lowers the pressure exerted by the air. Warm air is thus lighter (less dense) than cold air and consequently exerts less pressure. 3.

Detailed explanation-2: -In the free atmosphere, the air’s density decreases as the air is heated. Pressure has the opposite effect on air density. Increasing the pressure increases the density.

Detailed explanation-3: -Low-pressure systems are associated with clouds and precipitation that minimize temperature changes throughout the day, whereas high-pressure systems normally associate with dry weather and mostly clear skies with larger diurnal temperature changes due to greater radiation at night and greater sunshine during the day.

Detailed explanation-4: -Low-pressure areas are commonly associated with inclement weather (such as cloudy, windy, with possible rain or storms), while high-pressure areas are associated with lighter winds and clear skies.