Question

1. why is the presence of water vapor in the atmosphere important?

it is a greenhouse gas that helps regulate temperature.
it causes rapid cooling
it has no effect.
it is harmful to life.

1. how does earths atmosphere maintain a balance of gases?

through volcanic activity
through the water cycle
through natural processes like photosynthesis and respiration
through human intervention

1. what role does earths magnetic field play in making the planet habitable?

it absorbs sunlight
it controls weather patterns
it protects the planet from solar wind and cosmic radiation.
it regulates ocean currents.

Explanation:

• For question 11: Water vapor is a greenhouse gas. Greenhouse gases trap heat in the atmosphere, helping to regulate the Earth's temperature.
• For question 12: Photosynthesis (by plants) takes in carbon dioxide and releases oxygen. Respiration (by most living organisms) takes in oxygen and releases carbon dioxide. These natural processes help maintain a balance of gases in the atmosphere. Volcanic activity mainly releases gases like carbon dioxide and sulfur dioxide. The water cycle is about water (not gas balance). Human intervention can disrupt gas balance (e.g., deforestation reducing photosynthesis).
• For question 13: The Earth's magnetic field acts as a shield. Solar wind is a stream of charged particles from the Sun, and cosmic radiation is high - energy radiation. The magnetic field deflects these harmful particles. It does not absorb sunlight (the atmosphere and surface do that), control weather patterns (atmospheric circulation etc. do that), or regulate ocean currents (density differences, wind etc. do that).

Answer:

1. It is a greenhouse gas that helps regulate temperature.
2. Through natural processes like photosynthesis and respiration.
3. It protects the planet from solar wind and cosmic radiation.