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