Chemical substances have many uses. But did you know that the chemical substances can also be harmful? Chemical substances can cause pollution of our environment.

Land Pollution. Land pollution means destroying the quality of soil used for agriculture. Soil is polluted when its topmost layer is destroyed. This happens when farmers use too much fertilizer and pesticide. These are chemical substances that kill the tiny animals and other organisms in the soil which feed on the remains of dead plants and animals. Without them, the soil cannot get the nutrients from dead plants and animals that it needs to be productive.

Soil is also polluted when it becomes salty. This happens when seawater seeps into the land. When the water evaporates, it leaves salt in the soil. Poisonous wastes from mines and some factories also pollute the soil.

Water Pollution. Observe the water that comes out of your faucet. Does it look ... Read more »