Ineed plz with the first question plz

c is the answer because when something is left after something evaporates that shows the chemical change.

with this one i know the answer in craters one reason i looked it up and i learned about it there is my evidence

warm front forms when a moist, warm air mass slides up and over a cold air mass. as the warm air mass rises, it condenses into a broad area of clouds. a warm front brings gentle rain or light snow, followed by warmer, milder weather.

hope i !