imp notes on naturaĺ resource
Answers
Keynotes for Chapter - Natural Resources, are:
Rain
Rain is formed by evaporation and condensation of water through water cycle.
Acid Rain
Acid rain is caused by the release of the gases like SO2 (sulphur dioxide) and NO2 (nitrogen dioxide) released from the emission of vehicles and combustion of fuels. These gases dissolve in rain water to form nitric acid and sulphuric acid.
Water
Water is a renewable resource.
It is essential for all physiological activities of plants and animals.
Water is mainly present in two forms:
(i) Surface water
(ii) Ground water
Soil
It is the uppermost layer of Earth’s crust, which supports terrestrial plants, animals and microorganisms.
It is formed from the weathering of rocks by physical, chemical and biological activities by the action of wind, water and sun.
It is made up mainly of mineral particles, organic materials, air, water and living organism.
Humus
The decayed living organisms present in soil is called humus.
Humus makes the soil porous and allows water and air to penetrate deep underground making the soil more fertile.
Water cycle
The whole process in which water evaporates and falls on the land as rain and water flows back into the sea via rivers is known as the water-cycle.
Answer:
Natural resources are resources that exist without any actions of humankind. This includes all valued characteristics such as magnetic, gravitational, electrical properties and forces, etc.