Population of species decreasing over a period called as?
The SI unit for all forms of energy is:
The outermost layer of the earth is called:
In chemistry, the carbon-hydrogen are named as:
Thousands of mirrors or curved metals are used to focus solar energy to make it very hot, in
Layer which protects earth from harmful rays of run is
Smoke with ozone react to form
Black painted panels which are hanged at roofs to trap heat and energy from sun, are
When animals and plants are rotten in absence of air, there produces a gas called
Plants material and waste from living things are regarded as
Photochemical haze that forms when sunlight acts on industrial pollutants or burning fuels is known as
Crude oil is so valuable that it is often called
People stopped using coal nowadays because it causes
Trapped heat inside earth is known as