アメリカ内務省さんのインスタグラム写真 - (アメリカ内務省Instagram)「Why are the Blue Ridge Mountains blue? The trees growing along the ridgelines produce high levels of a compound call isoprene. The isoprene hovers around the thickly forested mountains like a haze and scatters the different wavelengths of light and the short, small waves of blue dominate our receptors. Of course, the best place to see the effect is while resting or traveling along the #BlueRidge Parkway in #NorthCarolina and #Virginia. With amazing views, hiking trails, waterfalls and wildlife, the mountains might be blue, but you won't feel that way. Photo @BlueRidgeNPS courtesy of Joshua T. Moore (@jtm71). #usinterior」7月28日 9時05分