Autumn is gradually deepening and leaves
are changing their colors little by little. Trees sense the approaching of bitterly
cold winter and begin to prepare for enduring this harsh season.
Because of the sharp drop in temperature,
trees stop supplying water to their leaves. Due to dryness, chlorophyll in
the leaves changes gradually into coloring matter, which causes the leaves to take
on flaming autumnal tints before their falling.
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