They adapt because they are forced to survive. An example would be certain animals gaining the ability to camouflage to protect themselves from predators.
"Lapilli <span>are pyroclastic materials that are larger than ash but smaller than blocks or bombs.</span>"
Lapilli is pyroclastic material that has a dimention of 2 to 64 mm. Lapilli are of really low density what gives them the ability to be projected and taken far in a volcanic explosion. They start by being molten/semi-molten lava that solidifies as travelling through the air or reaching the water.
In summer, the amount of green pigment and chlorophyll are much more, in fall, the amount of chlorophyll and green pigment is less. That's the reason the leaves turn colors.