A layer of tissue in which cells and mineral conveyor in the Cambium layer, created in the period 1 year to make wood look like a band that has some thickness, depending on the size, growth rate of trees in the 1-year period.
Layers of tissue water and minerals which are cells in the cambial built during the first years of wood with a range of sizes, thickness, depending on the rate of tree growth in a period of one year.
I vascular tissue water and minerals which cells in the cambium layer built during the period of one year, wood is a band size thickness depends on the rate of growth of trees in time. One year.