Coal and Petroleum
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 Resources: Dams, Water Harvesting
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 & Movements
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
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
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Environmental Problems: Depletion of Ozone Layer & Garbage Disposal
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
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...
Environment & Eco System
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...
Non-Conventional Sources of Energy: Solar Energy, Tidal Energy, Geothermal Energy & Nuclear Energy
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...
Conventional Source of Energy: Fossil Fuels, Hydro-power Plant, Bio Gas & Wind Energy
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
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...