What is air pollution? Or what is water pollution? What are the measures that we can take to stop the pollution? We can say that the substances making the water dirty are known as contaminants. Or the natural air gets polluted with smoke.
Meaning (Pollution):
When unwanted substances are present in the environment, they affect several aspects. For example:
Plants
Animals
Biological components
Physical components
Pollutants:
The source of pollution is any substance. The pollutants can be anywhere.
Liquid
Solid
Gaseous
Such pollutants occur when their concentration is more than natural abundance.
Types:
Air Pollution:
The presence of pollutants in the air causes air pollution.
Water Pollution:
Dirty material and other raw materials in water cause water pollution.
Sound Pollution:
When in a particular area, more rush of vehicles can cause sound pollution.
Soil Pollution:
Excessive use of fertilisers and pesticides in the soil causes soil pollution.
Some measures to prevent pollution:
Many measures can prevent all types of pollution. Some are below:
One must use the CNG.
Do the proper management of assets.
To increase the use of public transportation.
Use unleaded petrol.
Learning Videos for 8th Grade Science - Pollution of Air and Water
Pollution of Air and Water Sample Questions for Class 8
Question 1
On a cold, winter day, Sheena rubs her hands together. Stored chemical energy is transformed into mechanical energy. Due to the Law of Conservation of Energy some of the energy is also transformed into energy.
A. heat
B. light
C. solar
D. kinetic
Question 2
Which statement about the Law of Conservation of Mass is NOT true?
A. The mass of reactants must equal the mass of products.
B. All the atoms on the reactants side of an equation are also on the products side.
C. The reaction creates new types of atoms.
D. Atoms are not lost, but are rearranged.
Question 3
When water evaporates, it turns into .
A. water vapor
B. water
C. ice
Question 4
Forces always act in equal but opposite pairs. This is Newton's law of motion.