Coal (Formation, Types and Importance)
What is coal? Coal is a solid, black, readily combustible fossil fuel found as thick layers in deep mines under the surface of the earth. […]
Geology and Astronomy
Fossils (Formation, Types and Importance)
What are fossils? The term fossil comes from the Latin word fossilis, which literally means ‘dug up’. Fossils are the remnants, impressions, or traces of […]
Ozone layer (Importance, depletion, effects and protection of ozone layer)
Ozone is a pale-blue gas that forms a layer in the stratosphere of our atmosphere called ozone layer. This layer absorbs about 99% harmful solar […]
Acid rain (Formation and effects)
Various industrial gases like carbon dioxide, sulphur dioxide, sulphur trioxide, nitric oxide, nitrogen dioxide in reaction with water of the atmosphere form acids. Those acids […]
Greenhouse effect (Sources, effects, importance and controlling measures)
Different types of gases like carbon dioxide, chlorofluorocarbon, methane, oxides of nitrogen, water vapor etc. is present in the troposphere of the atmosphere. These gases […]
History of the earth and geological time scale
Earth is a member of the solar system and it revolves round the sun. It is very difficult to give the exact date of the […]
Hazards and Natural Disasters
Hazards: The situation that brings a threat to life, health, property or environment e.g of Natural Hazards: flood, volcanic eruption, earthquake, cyclone etc. Natural disaster: […]
Different layers of atmosphere
Atmosphere: The thick layer of air that surrounds the earth’s crust is called the This canopy of air covers the lithosphere (the crust and the […]