I'm pretty sure it is coal
hope this helps!
Sound travels faster in cold air bro
the speed of light is the right answer
The weight of an object is the strength of the gravitational force on it.
So if the gravitational force changes, the object's weight changes.
Wavelength is the length from one peak of a wave to the next, while frequency is the amount of waves present in a unit of time. The greater the wavelength the smaller the frequency. The smaller the wavelength, the bigger the frequency.