Learn Class 9 with Free Lessons & Tips

The Rain forests are known to be found in places receiving more than 230 cms of rainfall and which has a monthly mean temperature of 18C or even higher in the coldest month of the year. They are known to occupy more than 7 % of the earth’s surface and harbour more than 55 per cent of the terrestrial plants and animals of the entire globe. It is known that rain forests are very dense or thick and they receive 200 cms of rainfall annually and the sunlight does not even reach the ground in some of the areas.

The reason why they are also called the evergreen forests is because different trees shed leaves at different times of the year.

Andaman and Nicobar islands, slopes of western ghats, Assam. West Bengal, Odisha are the places where you can find tropical rainforest areas. These areas experience the humid climate and abridged dry season. Rosewood, ebony and mahogany are the trees which are abundant here and the most commercially used.

The age structure of any given population is the classification of the distribution of people according to their ages.

The death rate is the total amount of deaths in a given year or the annual count of deaths per 1000 in a given particular area’s population.

The live births total in a given year or the annual count of births per 1000 in a given particular area’s population.

The biggest waterfall in India is the Kunchikal waterfalls. It is located on the Shimoga - Udupi border of Karnataka. The water that flows down the waterfall is from the river Varahi. It is ranked as the 116th in the world and India highest waterfall. The waterfalls from a height of 455meters, in a cascading manner over the rocky structures. The waterfalls close to the Hulikal Ghati Temple.

The water directly falls into the reservoir of the Mani dam, which greatly cuts down the speed of the flow of water. A hydraulic power plat is also built at the foot of the waterfalls, to generate electricity. 

The right time to visit this waterfall is during the rainy season. During this season, the waterfall is surrounded by greenery, and it is a delight to watch the tributaries formed by the Varahi river, as it falls into the waterfall.

The wind that is from the south region and south-east Asia that blows from the month of May to September, which brings rain can be called as monsoon rain. It is a seasonal shift that brings torrential showers and heavy thunderstorms.

Break monsoon is the absence of rains during the period of monsoon. As in the monsoon trough shifts closer to the foothills of himalayas, which inturn leads to a sharp decrease in rainfall over majority parts of India.

It is no doubt that receding monsoon brings abnormal changes in precipitation which in turn affects the farming and also the farmers.

In layman’s terms, it is 

a dry spell during the months of monsoon. It is also to be known that sudden bursts of rainy periods also occur and we all know the reason for it. Global warming.

Population Change

•  It is the change in the population of the country, over a given period.
• Three main factors, like the birth rate, the death rate and the migration of people from one country to another, affects the change in population.
• Increase in the birth rate and decrease in the death rate increases the people of the entire country.
•  Internal migrations, from one city to another, will not affect the remaining population. However, immigration to different countires will either decrease o increase the net population.

Population Growth

• It is referred to as the increase n the overall population of the country.
• It is expressed in terms of percentage, by calculating the number of people added to the country.
• Increase in the annual growth means that there is a growth of population in the country

Health is an essential aspect of a population. If one person is unhealthy, it was affected and infected others around them. If each individual takes measures to stay healthy, it will lead to a healthy population. So, it is essential to stay healthy. Here are a few advantages of having a healthy population:

• Controls Obesity: Obesity increases the risk of heart attacks, cholesterol, breathing difficulties etc. So, it is essential to maintain your body weight by taking good care of your health. You can achieve this by doing moderate to high-intensity physical activity and switching to healthier options for food.
•  Improves your mood: Eating right and getting a fair amount of exercise, can boost your productivity at the workplace. It boosts your mood and keeps you energetic throughout the day. This can make the environment lighter and leads to a happier and stress-free environment.
• Combats diseases: We've all experienced epidemic and pandemics, which spreads due to unhealthy lifestyles and eating habits. By maintaining a healthy lifestyle, we can prevent the spread of such diseases in the world.  
• Boosts energy: By continuing a healthy lifestyle and making healthier food choices, you can improve your productivity at work and also prevent procrastination. 
•  Longevity: Healthy lifestyle is directly related to your mind and keep your mind healthy. This aids in extending your lifespan and decrease the mortality rate overall.