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