A forest, also referred to as a wood or the woods, is an area with a high density of trees. As with cities, depending on various cultural definitions, what is considered a forest may vary significantly in size and have different classifications according to how and of what the forest is composed. A forest is usually an area filled with trees but any tall densely packed area of vegetation may be considered a forest, even underwater vegetation such as kelp forests, or non-vegetation such as fungi, and bacteria. Tree forests cover approximately 9.4 percent of the Earth's surface (or 30 percent of total land area), though they once covered much more (about 50 percent of total land area). They function as habitats for organisms, hydrologic flow modulators, and soil conservers, constituting one of the most important aspects of the biosphere.
A typical tree forest is composed of the overstory (canopy or upper tree layer) and the understory. The understory is further subdivided into the shrub layer, herb layer, and also the moss layer and soil microbes. In some complex forests, there is also a well-defined lower tree layer. Forests are central to all human life because they provide a diverse range of resources: they store carbon, aid in regulating the planetary climate, purify water and mitigate natural hazards such as floods. Forests also contain roughly 90 percent of the world's terrestrial biodiversity.
Famous quotes containing the word forest:
“All nature is a temple where the alive
Pillars breathe often a tremor of mixed words;
Man wanders in a forest of accords
That peer familiarly from each ogive.”
—Allen Tate (18991979)
“I was struck by this universal spring upward of the forest evergreens.”
—Henry David Thoreau (18171862)
“For Nature ever faithful is
To such as trust her faithfulness.
When the forest shall mislead me,
When the night and morning lie,
When the sea and land refuse to feed me,
Twill be time enough to die.”
—Ralph Waldo Emerson (18031882)