1. Which of the following makes ice cores so useful in determining the composition of the atmosphere in the past? (Points: 1)
the presence of pollen
fossilized plants
air bubbles
the temperature of the core
2. How are the changes in atmospheric carbon dioxide described? (Points: 1)
Carbon dioxide levels have remained the same.
Carbon dioxide levels have decreased.
Carbon dioxide levels have increased.
Carbon dioxide levels cannot be measured.
3. Which of the following is a list of greenhouse gases? (Points: 1)
oxygen, nitrogen, carbon dioxide
water vapor, oxygen, sulfur
water vapor, nitrogen, helium
water vapor, carbon dioxide, methane
the presence of pollen
fossilized plants
air bubbles
the temperature of the core
2. How are the changes in atmospheric carbon dioxide described? (Points: 1)
Carbon dioxide levels have remained the same.
Carbon dioxide levels have decreased.
Carbon dioxide levels have increased.
Carbon dioxide levels cannot be measured.
3. Which of the following is a list of greenhouse gases? (Points: 1)
oxygen, nitrogen, carbon dioxide
water vapor, oxygen, sulfur
water vapor, nitrogen, helium
water vapor, carbon dioxide, methane