Archive | Question and Answers

Nitrogen constituents about 78% of air by volume. It is an important constituent of proteins and is present in the form of ammonium salts and nitrates in the soil.

Lavoisier heated a small amount of mercury over a coal oven in a retort. The mouth of the retort was inserted in a bell-jar placed in a trough filled with mercury.

The process of protecting natural resources is called conservation. Thus, protecting soil fro being eroded is Soil Conversation.

The process of carrying away of the topsoil by various agents like rain, rivers and wind is called soil erosion.

Any substance that adversely affects the productivity of soil is called a soil pollutant. Contamination of soil with pollutants like insecticides, artificial fertilizers and industrial wastes is called soil pollution.

Soil is the uppermost layer of the Earth’s crust, capable of supporting life. You know that the earliest civilizations almost always arose near river banks.

Universe is the vast empty space around us and everything that is in it. It contains numerous heavenly bodies like the sun, the planets, moon, stars, meteors and meteorites.

Weather is our most common topic of conversation, a factor in must of our agricultural, industrial and civic planning and a matter of constant concern- whether it is for planning a simple picnic, what we eat or wear, our work, our safety, etc.

Rainfall occurs due to the ascent of moisture bearing clouds or a body of moist air and its subsequent cooling, condensation and precipitation.

The amount of water vapor present in the air is called humidity. It is greater in summer than in winter, during day it is more than night and also it is more at lower altitudes than at higher altitudes.

Water in the air can be in the form of vapor (gaseous), rain, mist, cloud (liquid) or even as snow (solid).

Electronic mail lets you send messages and receive messages in electronic form. The person you communicate with could be any other users on the internet.

Sant Kabir was brought up by a Muslim weaver. No one knew whether he was born a Hindu or a Muslim as eh was found as a small baby, left alone on a river bank.

Nutrients are the chemical elements and compounds needed for organisms to grow and function.

Each and every community undergoes a serious changes and a group of organisms is established which can live and reproduce most successful in the area.

Energy is the capacity to work. Energy exists in two forms such as potential and kinetic. Potential energy is the energy at rest (stored energy).