atmosphere, the mixture of gases that surrounds a planet, balloon, , capsule, the part of a spacecraft in which people live and work, engine, , force, the amount of physical power with which something moves or hits another thing, gravity, the force that causes something to fall to the ground or to be attracted to another planet, helium, a gas that is lighter than air and is used to make balloons float, oxygen, a gas that has no colour or smell, is present in air, and is necessary for most animals and plants to live, parachute, , the sound barrier, the sudden increase in air pressure against a vehicle, especially an aircraft, when it is travelling near the speed of sound, descent, the process of going down.
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WW4 U5
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Anastasiia29
5–9 класи
ESL
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