Look online for the growth of the trunk of a tree. estimate how much time does it take for a water oak to grow one inch in diameter. estimate the growth rate over a year.

wire in brush may conduct electricity from cell to drill and vice versa electrc shock possible

luster is not a good characteristic to use by itself because luster is the property of minerals that indicates how much the surface of a mineral reflects light. the luster of a mineral is affected by the brilliance of the light used to observe the mineral surface.