Autumn Coloured Trees Against A Blue Sky, United States Of America

chlorophyll chloroplasts photosynthesis endothermic transformation beauty in nature autumn colours golden yellow orange changing season tree aspen tree aspen forest landscape leaf pigment beauty nature leaf pigment united states of america photography color image horizontal outdoors no people day scenics physical geography non urban scene tranquil scene growth usa us united states north america american north american colour image colour color outside nobody no one no one topography scenery scenic scene scenes picturesque the natural world tranquility serene serenity peaceful natural beauty