Question

which of the following are greenhouse gases?
carbon dioxide, methane, oxygen, argon
water vapor, ice crystals
methane, nitrogen, helium
carbon dioxide, methane, water vapor

question 2
if the moon is located between the earth and the sun, which phase will we see from earth?
full moon
new moon
crescent moon
quarter moon

Explanation:

• Greenhouse Gases: Greenhouse gases trap heat in the Earth's atmosphere. Carbon dioxide (\(CO_2\)), methane (\(CH_4\)), and water vapor (\(H_2O\)) are well - known greenhouse gases. Oxygen (\(O_2\)) and argon (Ar) are not greenhouse gases. Nitrogen (\(N_2\)) and helium (He) are also not greenhouse gases. Ice crystals are not a gas.
• Moon Phases: When the moon is between the Earth and the sun (in the new moon phase), the side of the moon facing the Earth is not illuminated by the sun. In a full - moon phase, the Earth is between the sun and the moon. A crescent moon occurs when a small portion of the moon's illuminated side is visible from Earth, and a quarter - moon occurs when half of the moon's illuminated side is visible.

Answer:

• First question: carbon dioxide, methane, water vapor
• Second question: new moon