As fall turns to winter, nature's most dramatic transitions are seen in the countryside. Leaves turn, then tumble, shrouding the ground in autumn hues. The trees they leave behind are soon covered with the first layer of frost. Snow is close on its heels, blanketing the landscape in winter white.

• As fall turns to winter, nature's most dramatic transitions are seen in the countryside. Leaves turn, then tumble, shrouding the ground in autumn hues. The trees they leave behind are soon covered with the first layer of frost. Snow is close on its heels, blanketing the landscape in winter white.