Little holes on the underside of leaves that allow gases to pass.
Visible imperfections in wood grain that are circular and darker than the surrounding area.
A tree that does not lose its leaves .
A group of trees in a given area.
A gas composed of carbon and oxygen, produced during respiration.
The top branches and leaves of the trees in a forest.
The building of a new forest by planting or reseeding.
The practice of managing, conserving and creating forests.
The visible outer covering of a tree that protects the inside.
The fluid part of a plant rich in sugar and starch that moves up and down the plant in the phloem tissue of the bark.
A method of harvesting trees where all standing trees are removed from a section of forest at one time.
The largest trees in forests that act as central hubs for vast below-ground networks.
Medium-sized deciduous trees reaching 15-30 m (50-100 ft) tall. In North America, the aspen is referred to as quaking Aspen or Trembling Aspen because the leaves "quake" or tremble in the wind.
Trees and plants that lose their leaves annually every autumn.
A tree that bears cones and has needles or scale-like leaves.
Rings that are present on a cross-section of a tree trunk represents and determine the age of a tree.
The removal of trees for a variety of uses.
The growing part of the tree where cells form wood
A colourless, odourless gas and makes up about 21 percent of the Earth's atmosphere.
Its functions are to absorb nutrients and water, store nutrients and food, and anchor the tree to the ground
The national tree of Canada.