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10
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16. The speed of sound is not _______.
constant (can change)
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Check
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Check
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eraser
Reset score!
Oops!
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rocket
Go to first place!
Okay!
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gift
Win 25 points!
Okay!
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thief
Give points!
5
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25
10
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11. A peregrine falcon is _______. It can dive faster than any creature can run.
magnificent (impressively beautiful)
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10
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4. A cheetah can't run as fast as a peregrine falcon can _______.
swoop (fly downward)
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10
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2. To escape Earth's _________ and travel into space, a rocket ship must go faster than any jet.
gravity (The force that attracts a body towards the center of the earth)
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Check
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Check
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boom
Lose 50 points!
Oops!
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gift
Win 25 points!
Okay!
×
rocket
Go to first place!
Okay!
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baam
Lose 10 points!
Oops!
10
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10. You can turn off your rockets and ______ after you're in space.
coast (Keep moving without using additional power)
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10
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3. Sometimes speeds are hard to _______.
measure (ascertain the size, amount, or degree of something)
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10
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9. Light beams flashing through space are usually shown as bright ______.
rays (light)
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10
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1. Some __________ planes can fly more than 483 kilometers per hour (300 miles per hour).
propeller (revolving shaft)
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10
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15. A runner can reach a _______ of 24 kilometers per hour.
speed (The rate at which someone or something moves)
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10
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6. Some meteoroids ______ through space at 241,402 kilometers per hour (150,000 miles per hour).
streak (Move very fast in a specified direction)
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10
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12. A light ______ will flash out at the amazing speed of 299,338 kilometers per second.
beam (A light sturdy of squared timber or metal)
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Check
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thief
Give points!
5
10
15
20
25
×
gift
Win 15 points!
Okay!
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fairy
Take points!
5
10
15
20
25
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lifesaver
Give 20 points!
Oops!
10
×
14. Light is the fastest travelling thing in the whole _______.
universe (all existing matter and space)
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10
×
13. At high _______, where jets fly, sound waves travel about 1,062 Kilometers per hour.
altitudes (The height of an object from sea or ground level)
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Check
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Check
×
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