Which refers to the rate of change in velocity? speed
O acceleration
O direction
O magnitude

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:

.) the observation by semmelweis that more mothers died of childbed fever when their doctors also worked in the morgue