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final revision grade 4

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