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give reasons why old windmills were used?
to crush/ grind the grains
what happens when we increase using biofuel?
we cut a lot of trees and cause deforestation
any substance that produces thermal energy when it on burning
fuel
A type of biofuel that can be made of grass and wood chips
biofuel
what happens when kinetic energy applied to wind turbines decreases?
wind turbines move faster and produce more energy
true or false: when water freezes, its volume increases
true
true or false: electrical energy can be produced by air and water movement.
true
True or false: there is energy loss when energy is transformed from one form to another.
true
A liquid that stores chemical energy and used to operate cars.
Gasoline / oil
give reasons smog produced from burning fuel is very dangerous.
because it causes irritation of eyes and lungs
give reasons we must decrease using fossil fuel.
(1) to decrease air pollution (2) because fossil fuel non-renewable energy resource
what happens when there is a difference between temperature of cold air and hot air?
wind blows
what happens when sea creatures are buried under earth for millions of years
their bodies decompose forming oil and natural gas
- the stored energy in batteries is --------------, while the produced energy from batteries is --------------
chemical energy - electric energy
give reasons coal is considered as non-renewable resource of energy
because it takes millions of years to be formed
To operate an electric mixer, we need ----------- energy.
electric
--------- canyon has rocks of black and brown.
Wadi Nakhr
true or false: most of the wasted energy of the devices is light energy.
False "heat"
what is the change of energy that happens in the electric fan?
from electric energy into kinetic energy
what happens if the solar panels doesn't get sunlight?
it will not produce electric energy.
give reasons why valleys and canyon have different shapes.
because they are different in the types of rocks, size of river and speed of river flowing.
(T) or (F) all canyons have the same shape and same rocks.
False
A canyon may be formed due to the effect of ----- of water.
weathering and erosion
give reasons wind moves from a place to another
due to the difference in temperature between cold air and hot air
right or wrong we can use grass and wood chips to produce liquid biofuel.
right
right or wrong as the speed of a car increases, it uses less fuel.
wrong
give reasons canyons may be formed.
due to the weathering and erosion effect by water
the force that pulls down broken rocks on a mountain.
gravity
Give reasons farmers must decrease using pesticides.
because pesticides cause pollution of soil, water and air.
the type of electricity produced by from water turbines is called ------------------
hydroelectric energy
oil is formed from decomposition of old -----------------------, while coal is formed from decomposition of old -----------------------
marine animals - plants
Global warming is a phenomenon that causes ------------- temperature of earth because ------ gas trap heat in the air
increase - carbon dioxide
Energy can neither be created nor destroyed, but only converted from one form to another
the law of conservation of energy
give reasons why Water play an important role in the formation of limestone cave
because water dissolves the rocks and minerals rearrange themselves to form limestone rocks
right or wrong If there is no erosion process, there is no deposition process
right
A building that is built across rivers to control the water flow and increase its potential energy
hydroelectric dams
what happens to the car movement when the fuel runs out?
the car stops moving
cross the odd word: solar cell – hand mixer – solar panel – green house
hand mixer
cross the odd word: water – wind – coal – sun
coal
energy stored inside gasoline.
chemical energy
give reasons why iron inside rocks may rust
because the iron combines with oxygen gas forming rust
Give reasons we feel warm although we don’t see the sun in the sky.
because air, water and ground absorb solar energy during the day time
A glass building that is used in cold areas to plant crops which grow in warm climate
greenhouse
energy used when playing a drum
kinetic energy
using renewable resources of energy increases the temperature of air.
wrong
when water travels downhill, its speed --------------.
increases
landform formed by erosion and deposition of sand in a sandy desert environment
sand dunes
gas in air that combines with iron in some rocks forming rust
oxygen gas
the wasted energy produced from operating mobile phone for long time
thermal energy
form of energy stored inside plants
chemical energy
ow land between mountain that have gentle slope.
valley
process by which sediments are dropped down into a new place
deposition
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