Science

Coal and Petroleum Coal and petroleum are non-renewable natural resources. Coal was formed from the remains of trees buried deep inside the earth some...

Water Water is a basic necessity for all terrestrial forms of life. Irrigation methods like dams, tanks and canals have been used in various...

Forests and Wildlife Forests are 'Biodiversity hotspots'. Hotspot means an area full of biological diversity. The biodiversity of an area can be measured by determining...

Natural Resources Resources provided to us by nature soil, air, water, forests, wildlife, coal and petroleum are used by man for his survival. Types of Resources ...

Environmental Problems Changes in environment affect us and our activities change the environment around us. Environmental problems caused by humans: depletion of the Ozone Layer...

Food Chain It is the sequence of living organisms in which one organism consumes another organism for energy. It is unidirectional (single directional). In a...

Our Environment Environment means everything which surrounds us. It may include living (biotic) and non-living (abiotic) components. Biotic: Plants and animals. Abiotic: Air, water etc. Environment...

Solar Energy The energy emitted by the sun in form of heat and light is called solar energy. Solar Constant = 1.4 (kJ/s.m2) Outer edge of the...

Fossil Fuels Fuels developed from the fossils. e.g. Coal & Petroleum. Formed over millions of years ago have only limited reserves These are non-renewable source...

Sources of Energy Energy comes in different forms and energy can only be converted from one form to another. For example, if we drop a...