J. when all the trees in an area are destroyed.
deforestation
A.a group of animals or plants of the same kind
species
B. when a type of animal or plant stops existing
extinction
D. a long period of weather when there is not enough water.
drought
E. fuels such as coal or oil that are produced by animals or plants decaying over millions of years
fossil fuels
I. a large mass of ice that moves slowly down a mountain valley.
glaciers
G. all the animals and plants in an area and their relationship to each other and their environment
ecosystem
C. the natural environment in which a plant or animal lives
habitat
H. substances that are sent out into the air
emissions
F. when a large number of people have little food for a long time and some people die
famine