: Match the words (1-7) with their meanings (a-g).
1. Gas
2. Carbon dioxide
3. Greenhouse effect
4. Atmosphere
5. Hunger
6. Underweight
7. Leftover
a) Too thin
b) a process that occurs when gases in Earth's atmosphere trap the Sun's heat
c) a lack of food
d) the part that has not been used or eaten when the other parts have been
e) a substance in a form like air
f) the mixture of gases around the earth
g) the gas formed when carbon is burned, or when people or animals breathe out