Define "extinct"
An animal species no longer alive
endangered
An animal on the brink of becoming extinct
Cardboard
A thick piece of paper
crops
certain edible plants grown on land, such as soya, grains, etc.
ice caps
the ice around the North and South Pole
flood
a lot of water
waste
material that people throw away because they don't want/need it anymore
pollution
things that make the water, air and ground unclean
laws
official rules that say what people are and are not allowed to do
melt
to change from solid to liquid
smog
smoke + fog and pollution
