What characteristic of waves is defined as the number of waves that pass a given point per unit time?
a. period
b. wave train
c. frequency
d. wave pulse

frequency

Explanation:

freq is basically the change ..the change will be in any thing..eg we say change in amplitude w r t time ,, how rapidly the amplitude change ..

the arctic is a region of the planet, north of the arctic circle, and includes the arctic ocean, greenland, baffin island, other smaller northern islands, and the far northern parts of europe, russia (siberia), alaska and canada.