A dangerous activity which results in many deaths due to gas explosion, caves in and flooding is

Solar cells and solar furnaces are

For heating, the more suitable flame is

Almost every resource of earth's energy can be traced back to

A moving car releases energy during process of burning

Sun, wind, running water, tides, biomass, and geothermal resources are known as

Modern wind turbines produce

Fossils fuel which stores large amount of energy in a small volume is

Fossils fuel comes from the remains of organisms which lived

The energy in from of heat and light is obtained from

To play and work, we get energy from

The floating devices which are connected to chain for generation of electricity are called

Burning of fossils fuel is leading environment towards

The energy resources which would not run out are called

The products which are helpful in harnessing solar energy, are

Bio gas is a renewable source of

1 kilo joule is equal to

When wind blows across seas and oceans, there are seen

When air holes of a Bunsen burner are closed they give

Trapped heat inside the earth is known as