1) sun is made of ………………. a) hot gases b) dust and clouds c) ice 2) Turbines change wind energy to.......................... energy. a)  electrical b) kinetic c) sound 3) ……………… can be grown in the shade of existing trees. a) Coffee b) Potato c) lemon 4) What force keeps planets, moon, and other objects in orbit? a) Gravity   b) Magnetism c) Electricity 5) the red planet is............... a) Mercury b) Mars c) Venus 6) the closest planet to the sun is............... a) Venus b) Mars c) Mercury 7) The hottest planet is........... a) Mercury b) Mars c) Venus 8) The planet with life is............. a) Earth b) Jupiter c) Saturn 9) The planet with handle is............. a) Saturn b) Jupiter c) Earth 10) The largest planet in the solar system is........... a) Jupiter b) Saturn c) Earth 11) The largest planet in the inner solar planets is........... a) Earth b) Saturn c) Jupiter 12) The thinnest atmosphere is........... a) Venus b) Earth c) Mercury 13) A/an ……………..is a belt-shaped disc that separates inner planets from outer planets a) Iron belt b) Asteroib belt c) Comet trail 14) Human uses electric vehicles to reduce the demand for ………………. a) fossil fuel b) biofuel c) Liquid food oil 15) Jupiter atmosphere is made of hydrogen and………………. a) nitrogen b) oxygen c) helium 16) The …………….…… result from both Earth’s tilted axis and its revolution around the Sun. a) day and night b) months c) seasons 17) The …………….…… result from Earth’s tilted axis a) day and night b) months c) seasons 18) Using the object again is............. a) reduce b) reuse c) recycle 19) Using the object but in a smaller amount is............. a) recycle b) reduce c) reuse 20) Using the object but for another purpose is............. a) reuse b) recycle c) reduce 21) Which layer of the sun's atmosphere can always be seen with the human’s eyes? a) Chromosphere b) Photosphere c) Corona 22) Which layer of the sun's atmosphere be seen with the human’s eyes during total solar eclipse? a) Corona b) Chromosphere c) Photosphere 23) The sun formed of four main layers a) True b) False 24) An unplanned result called eco-friendly a) True b) False 25) The Earth is the 4th planet in the solar system. a) True b) False 26) The solar system is made of the sun and 7 planets only. a) True b) False 27) The curved path of an object around a star, a planet, or a moon is the solar system. a) True b) False 28) The spinning of earth on its axis is called ……………… a) rotation b) revolution c) Movement 29) Earth makes one complete rotation every ………………hours. a) 27 b) 365 c) 24 30) The side of earth that faces toward the sun experiences ……………… a) day b) night c) winter 31) Movement of one object around another object is called ……………… a) revolution b) rotation c) Movement 32) ………………is an imaginary line that goes through the center of an object. a) Orbit b) Axis c) Astorid belt 33) Circle the inner planet a) Mars b) Jupiter c) Neptune 34) Circle the inner planet a) Saturn b) Uranus c) Mercury 35) Circle the inner planet a) Saturn b) Pluto c) Venus 36) Circle the inner planet a) Earth b) Jupiter c) Saturn 37) Circle the outer planet a) Earth b) Jupiter c) Mars 38) Circle the outer planet a) Mercury b) Saturn c) Venus 39) Circle the outer planet a) Earth b) Mars c) Uranus 40) Circle the outer planet a) Venus b) Mars c) Neptune 41) the picture shows a) comet b) Astoroid c) Rock 42) the picture shows a) fishing b) cleaning c) recycling 43) the picture shows a) Eco-friendly b) Pollution c) Conservation 44) The presence of substances in the environment that are harmful to humans. a) Pollution b) Conservation c) Eco-friendly 45) …………………. is/are made up of gas and dust. a) Comet trail b) Clouds c) Nighty sky 46) ……………………is the layer in the sun where the energy is generated a) Corona b) Core c) Radiative and convective zone 47) The outer planets are also known as ……………………………… a) Small planets b) Huge gas c) Gas giants 48) What is the direction of the gravitational force? a) up b) To the left c) Down 49) ..................pulls every thing towards the earth's center a) Gravity b) Air c) motion 50) ...................the nearest planets to the sun a) inner planets b) outer planets c) solar system

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