The source of all energies on earth is ..................
The sun
planets
Acid rain is formed when ..........combines with rain water.
oxygen
carbon dioxide
The form of energy resulted from waterfalls is called ...... energy.
solar
hydroelectric
The power source for the electric fan is ...............
electricity
wind
An example of the renewable energy is ...........
oil
Hydroelectric power is produced using ..................
water
The output of solar panels is.......................
photo
Solar energy is used in ...........................
food preservation
cooking food
In water turbines, the ........ energy of water is changed into electrical energy.
light
kinetic
Using curved ......... in cooking food is one of the benefits of using the solar energy.
mirrors
wood
The sun’s energy is produced from a gaseous reaction.
Nitrogen
Hydrogen and Helium
When wind ......... energy increases, the windmill blades spin faster.
chemical
Both modern wind turbines and old windmills are similar in their.....
blades number
function
Modern wind turbines are................. the old vacuum mills
longer than
shorter than
Cars smog causes irritation of ...... of human.
the eye
the small intestine