CROWN- where the tree increases each year in height and spread of branches by adding on a new growth of twigs.
Heartwood- the supporting column of inactive (dead) gap-wood which gives the trunk strength and stiffness.
Sapwood (xylem)- new layers of wood that transports water and nutrients from roots to the leaves.
Cambium- microscopic layer of cells where growth takes place.
Inner bark (phloem)- carries food made in leaves down to the branches, trunk and roots.
Outer bark- hold in moisture and protects the tree from insects and disease, excessive heat and cold, and mechanical injury.