Question

important note of chapter natural resources...i want the notes of whole chapter...​

Answer 1

Heat protector – absorbs heat from sunlight, maintains the average temperature on the Earth’s surface

Wind – Distribution of heat over the Earth’s surface

Formation of Wind

Wind is formed as a result of the differential heating of the atmosphere.

During the day, wind blows from sea to land. This is known as sea breeze.

During the night, wind blows from land to sea. This is known as land breeze.

Factors that make soil

Sun

Heats the rock during the day Rocks cool during night time Formation of creaksbreaking of rocks

Water

Water in cracks freeze -> breaks rocks

Water carries rocks -> friction breaks rocks

Wind

Particles in air erode the rocks

Soil – Mixture of small rock particles, decayed living organisms [Humus]-> Makes rock porous

Air pollution

A change in the quality of air brought about by the addition of harmful substances, either by humans or by environmental processes, is termed as air pollution.

The important sources of air pollution are burning of fossil fuels, burning of wood; automobile exhaust, combustion, refrigerants such as Freon, aerosol sprays etc.

Water Pollution

A change in the quality of water brought about by the addition of harmful substances by humans is termed as water pollution.

Important factors that pollute water are fertilizers and insecticides, sewage from towns and cities, waste from factories/industries.

A change in the temperature of water is also a form of pollution.

Biochemical cycles

Greenhouse effect

Trapping of heat by gases (CO2) in the atmosphere.

Gases that cause the greenhouse effect are responsible for increasing the temperature of the Earth and thus contributing to the phenomenon called global warming.

Ozone layer

Ozone (O3) is a form of oxygen and is more stable than the two-atom oxygen (O2).

The ozone layer protects and prevents these ultraviolet radiations from reaching the Earth’s surface.

The pollutants that are responsible for depleting the ozone layer are gases such as chlorine and fluorine.

As a result of ozone depletion, a hole has developed in the ozone layer over Antarctica and its size has been steadily increasing over the years.

Answer 2

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