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27- mammal (n) the type of animal of which the mother feeds her children on milk
from her body
28- huge (adj) extremely large

29- temperature (n) a measure of how hot or cold sb/sth is
30- atmosphere (n) all the gases in the air around the earth (atmospheric :adj)
31- source (n) a place, person or thing you get sth from
32- available (adj) that you can get, buy or find (availability :n)
33- garbage (n) rubbish or waste food that you throw away (US English) (Syn: rubbish
(Br English)

34- patch (n) an area that is different from the area around it
35- biodegradable able to be changed into a natural state that won’t damage the
(adj) environment ( biodegrade :v) (opp: non-biodegradable)
36- take action (phr) do sth about a problem
37- device (n) an object that is used for a particular purpose

38- decade (n) ten years
39- bottom (n) the lowest part of sth
40- bacteria (n pl.) very small organisms that are found everywhere and are the cause of
many diseases (singular: bacterium)
41- pollution (n) making sth dirty with gas or poisonous chemicals (pollute :v, polluted
:adj)

1- coast (n) the land next to the sea (coastal :adj)
2- cave (n) a large hole in the side of a mountain or under the ground
3- cliff (n) a high area of land next to the sea

4- glacier (n) a large mass of ice that moves slowly down a valley
5- rainforest (n) a thick forest in the tropics
6- stream (n) a small river
7- valley (n) an area of land between hills

8- ocean (n) a very large expanse of sea, in particular each of the main areas into
which the sea is divided geographically.
9- pond (n) a small area of water, sometimes man-made

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