Question

which statements correctly describe the properties of air? select three options. air has mass but no weight. air pressure is created by the weight of the atmosphere pushing on earth’s surface. pressure is a measure of how tightly molecules are packed. denser air is heavier than less dense air. air is less dense at higher altitudes.

Explanation:

• Air has mass and weight (weight is mass under gravity), so the first option is incorrect. Pressure relates to force over area, not just molecular packing density, so the third option is incorrect. The correct options align with atmospheric science principles: atmospheric pressure comes from the atmosphere's weight; denser air (more mass per volume) is heavier for the same volume; air thins (is less dense) at higher altitudes due to reduced gravitational compression.

Answer:

• B. Air pressure is created by the weight of the atmosphere pushing on Earth’s surface.
• D. Denser air is heavier than less dense air.
• E. Air is less dense at higher altitudes.