Question

1. what is the role of greenhouse gases in earths atmosphere? they cause the earth to cool down. they block all solar radiation. they trap heat, maintaining temperatures suitable for life. they produce oxygen for respiration.

Explanation:

• Analyze Option 1: Greenhouse gases do not cool the Earth; instead, they retain heat, so this is incorrect.
• Analyze Option 2: Greenhouse gases do not block all solar radiation (some solar radiation reaches the Earth's surface), so this is incorrect.
• Analyze Option 3: Greenhouse gases (like CO₂, methane) trap heat (infrared radiation) emitted from the Earth's surface, which helps maintain temperatures that support life. This matches the scientific understanding of the greenhouse effect.
• Analyze Option 4: Greenhouse gases do not produce oxygen for respiration (plants produce oxygen via photosynthesis, and oxygen is not a greenhouse gas in significant amounts for this role), so this is incorrect.

Answer:

C. They trap heat, maintaining temperatures suitable for life. (Note: Assuming the third option is labeled C; if the original options have different labels, adjust the label but keep the description. Based on the text, the third option is "They trap heat, maintaining temperatures suitable for life.")