In today's laboratory investigation, you will be creating a two dimensional map of underwater hills or mountains. The purpose of this activity is to create a two-dimensional contoured map from a simulated, underwater, three dimensional model using sounding techniques. Working with your partner, place the wooden stick through each of the holes on the grid paper until you hit bottom. Record the depth in the same location on a separate piece of graph paper in millimeters. Mark the stick with a pen or pencil to show the various depths so that you won't have to measure the depth every time you move to another location on the grid.
Contour lines run through points of equal depth.