1.
Can be broken down into harmless products through action of microorganisms like bacteria.
2.
An environment where different species of plants and animals can be found.
3.
The land near a shore where water and land meet.
4.
The process in which water vapour cools and changes back into tiny water droplets.
5.
The process which water from the Earth's surface is heated by the sun and turns into water vapour.
6.
An overflowing of water onto land.
7.
A phenomenon where the average global temperature is is increasing due to the release of greenhouse gases into the atmosphere.
8.
Gases that absorb radiation in the atmosphere, leading to the warming of the Earth's surface.
9.
The natural environment where animals, plants and other living organism occupy.
10.
The method of providing water to dry land for farming.
11.
The action of making an environment impure or unclean.
12.
Channeling waste into open sea.
13.
Thick, black smoke caused by industrial and chemical activities.
14.
Bodies of flowing water.
15.
Forest with tall trees that are found in places near equator.
