Question

air cools when it moves from low to high altitudes. any time air moves upward, it passes through regions of successively lower pressure. so, the rising air expands and cools.
complete the paragraph.
compared to the base of a mountain, air pressure at the top of a mountain is and air is dense. so, as air rises to the top of the mountain, it energy and the air temperature tends to be

Explanation:

• Air pressure decreases with altitude. As air rises (like to the top of a mountain), it moves to regions of lower pressure.
• When air expands (due to lower pressure at higher altitudes), it does work (uses energy). According to the first law of thermodynamics, if a gas expands and does work \(W>0\) (assuming no heat transfer \(Q = 0\) for a quick - expansion process, like in the atmosphere), from \(\Delta U=Q - W\), \(\Delta U=-W<0\). The internal energy of the gas decreases, and since temperature is related to the internal energy of the gas (for an ideal gas \(U=\frac{f}{2}nRT\)), the temperature decreases.
• Less dense air is associated with lower pressure (at the top of the mountain compared to the base).

Answer:

lower; less; uses; cooler