Define : a) heathland b) greenhouse
c) extinct
d) endangered
e) smog
f) pollution
g) pesticides
h) leisure

✏Healthland- a tract of level wasteland; uncultivated land with sandy soil and scrubby vegetation.A Greenhouse is a building with glass walls and a glass roof. Extinction is the termination of a kind of organism or of a group of kinds, usually a species. Previously, any species of plant or animal that was threatened with extinction could be called an Endangered  species.Smog is air pollution that reduces visibility.Pollution is the introduction of harmful materials into the environment. A Pesticide  is defined as a chemical agent used to destroy or control pestsLeisure  has often been defined as a quality of experience or as free time.