text: why is the grass green and why are the mountains blue from far away? i need to know be thursday for a big science exam. please only answer if you know. the grass is green becuase in its cells it contains chloroplast, which contains chlorophyll which is used to help the plant with photosynthesis. and the pigment of chlorophyll is green which is to help it reflect green light and absorb other light for photosynthesis. mountains appear blue from far away because of the atmosphere. particles of atmosphere have a bluish tint, however, since the particles are so small, you cant see it. as you get farther away, there will be more particles of atmosphere between you and the mountain thus making it look blue.