It's the number of protons that are in an element
Answer:
Melting point
Explanation:
when a solid turns to a liquid, it is melting
it can travel by curved pipe by reflecting
but one cant see what is on the other side....
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Explanation:
Answer:
1.28second
Explanation:
The speed of light is constant everywhere, it is
299,792,458m/s=299,792.458km/s
Therefore it takes
