20,059
edits
Changes
no edit summary
==Key Stage 3==
===Meaning===
'''Pollution''' is the harmful [[Chemical|chemicals]] that go into the [[Environment|environment]] usually made by [[Human|humans]].
===Pollution in a Food Chain===
: When farmers grow crops, wild animals sometimes eat them, so the farmers spray the crops with poison.
: When the animals die from the poison, they are eaten by other animals which then also eat the poison.
: The poison builds up in the food chain, meaning the [[Top Carnivore|top carnivore]] often has a lot more poison than was originally sprayed on the crops. This can be very harmful to them and even kill them.
{| class="wikitable"
|-
|[[File:PoisonFoodChain.png|center|500px]]
|-
| style="height:20px; width:500px; text-align:center;" |In this [[diagram]] the poison is shown by yellow X's. If each gazelle eats two bushes, then the gazelles will get twice as much poison as the bush. If a cheetah eats two gazelles, then the cheetah will get twice as much poison as the gazelle had.
|}