Weather Things: Air

Air is composed mainly of nitrogen and oxygen, with water vapor varying significantly. It plays a crucial role in supporting life and maintaining Earth's temperature. Air movement, driven by the sun, affects weather patterns through high and low-pressure systems. Aerosols in the air can travel globally, affecting sky color and weather. Air is essential for flight, sound, and life. Wind results from air pressure differences, with rising warm air creating low pressure and sinking air creating high pressure, forming a continuous cycle.

What percentage of air is made up of nitrogen?

• 1%

• 4%

• 78%

• 21%

Which gas in the air can vary up to 4% and is crucial for life?

• Water vapor

• Nitrogen

• Oxygen

• Carbon dioxide

What are aerosols and how do they affect the environment?

• Solid particles that only cause pollution

• Particles and compounds that can travel and affect sky color

• Gases that are harmless and do not travel

• Liquid droplets that only cause pollution

What does a high-pressure system generally indicate on a weather map?

• Heavy rainfall

• Calm weather and light wind

• Snowfall

• Stormy weather

What is the term used for lines of equal pressure on a weather map?

• Meridians

• Isobars

• Contours

• Equators

How does air movement contribute to the rising of a hot air balloon?

• Air contracts and becomes heavier

• Air expands and becomes less dense

• Air cools down and rises

• Air becomes denser and sinks

What happens to air when it sinks and compresses?

• It creates low pressure

• It creates high pressure

• It becomes lighter

• It evaporates