Air Masses and Local Winds

Cooler air has...

• low pressure

• high pressure

• low density

• small number of particles

All of the following apply to warm air EXCEPT:

• It rises in atmosphere.

• It has low pressure.

• It has low density.

• It has high pressure.

Humid air is...

• less dense than dry air.

• more dense than dry air.

• the same density as dry air.

Compared to dry air, humid air has a...

• lower density so it will sink in atmosphere.

• lower density so it will rise in atmosphere.

• higher density so it will sink in atmosphere.

• higher density so it will rise in atmosphere.

During the day...

• cool, high pressured air rises over ocean.

• warm, low pressured air rises over ocean.

• cool, high pressured air rises over land.

• warm, low pressured air rises over land.

Rising air masses are...

• cold and low pressure.

• cold and high pressure.

• warm and low pressure.

• warm and high pressure.

Descending air masses are...

• cold and low pressure.

• cold and high pressure.

• warm and low pressure.

• warm and high pressure.

At night...

• cool, high pressured air rises over land.

• warm, low pressured air rises over land.

• cool, high pressured air rises over ocean.

• warm, low pressured air rises over ocean.

Why does air rise over land during day?

• Sand has a low specific heat so it heats up slower.

• Sand has a low specific heat so it heats up faster.

• Water has a low specific heat so it heats up slower.

• Water has a high specific heat so it heats up faster.

Why does warm air rise over ocean water at night?

• Water has a low specific heat so it cools off slower.

• Water has a low specific heat so it cools off faster.

• Water has a high specific heat so it cools off slower.

• Water has a high specific heat so it cools off faster.