What is the correct definition of a rarefaction? Orin a medium through which sound is passing, a zero-pressure region of a sound
wave
in a medium through which sound is passing, a low-pressure region of a sound
wave
in a medium through which sound is passing, a low-altitude region of a sound
wave
in a medium through which sound is passing, a high-pressure region of a sound
wave

weather forecasts are done by collecting data about the current state of the atmosphere mainly the temperature, humidity and wind and using meteorology, to determine the atmosphere that evolves over time. the h and l mean the high and low pressure. the red strip is a warm front. the blue strip is a cold front. the blue and red strip is a stationary front. the purple strip is a occluded front.

explanation:

true tan speed = ang vel x radius

it has to be b, about 97 percent.