In demography, the rate of natural increase (RNI) is a statistic calculated by subtracting the crude death rate from the crude birth rate of a given region. Developed countries have lower RNI values because they are usually more technologically advanced and have the necessary steps put into place to limit fertility.

The natural balance (or natural increase) is the difference between the number of births and the number of deaths recorded over a period.

The difference between the birth rate and the death rate of a country or place is called the natural increase. The natural increase is calculated by subtracting the death rate from the birth rate.

Natural population increase is a positive natural change, when the number of live births is larger than the number of deaths during the time period considered. Natural population decrease is the opposite, a negative natural change, when number of deaths exceeds the number of births.

It leads to the cutting of forests for cultivation leading to several environmental change. Besides all this, the increasing population growth leads to the migration of large number to urban areas with industrialization. This results in polluted air, water, noise and population in big cities and towns.

Man – made changes are those changes which are created by humans and it does not occur naturally . For example : pollution of air is created by humans by burning fossil fuels and smoke coming out from vehilcles and factories. man-made changes are those changes that occurs due to the activities done by man.

Ecosystems are in a constant dance as their components compete, react, evolve, migrate, and form new communities. Geological upheaval, evolution, climatic cycles, fires, storms, and population dynamics see to it that Nature is always changing.

☛There are two types of change in matter: physical change and chemical change. As the names suggest, physical changes never change the identity of the matter, only its size, shape or state.

Being in nature, or even viewing scenes of nature, reduces anger, fear, and stress and increases pleasant feelings. Exposure to nature not only makes you feel better emotionally, it contributes to your physical wellbeing, reducing blood pressure, heart rate, muscle tension, and the production of stress hormones.

When eggs are fried, they absorb heat energy. This breaks the weak chemical bonds that maintain the shape of the egg white proteins, causing them to uncurl. Therefore, frying an egg is a chemical change because it results in the formation of new particles.