Which of the following is not a man-made cause of global warming

Which pattern most likely came from a gunshot and which one was produced from a blow on the head? explain your answer?

Identify the various levels of atmosphere. troposphere mesosphere exosphere stratosphere thermosphere

Why do leaves change color in the fall? green pigments break down and no longer mask the color of chlorophyll. chlorophyll breaks down and no longer masks the colors of other pigments. red- and yellow-colored pigments grow and mask green-colored chlorophyll. green-colored chlorophyll breaks down and turns red and yellow.