21.
The temperature at which water boils depends mainly on:

22.
In a temperature inversion:

23.
A term biotype means

24.
Fatal degenerative lung disease caused by particulate asbestos is referred to as

25.
Radiations are harmful as it

26.
In middle latitudes, which cloud will have the lowest base?

27.
Which association below is not correct?

28.
The wind direction is:

29.
The pyramid of energy in any ecosystem is

30.
Barnacles growing on the back of whale is an example for