Use interpolation (estimation based on surrounding values) and extrapolation to estimate and label clevations of all points below that are not labeled. then add contour lines using a contour interval of 100 feet. notice how the 0-foot and 100- foot contour lines have already beer drawn. 2. sometimes your data will be in between the lines, and you need to interpolate. use interpolation to give some elevation values between the lines. 3. what is the elevation at y? 4. what is the elevation at z? 20 ocean 5. practice interpolating: 12ร 112 1007890105 1v 5 3 4 110 9 193 12216130 4o "25 18 0 1? 3* 7. label the contours on the figure below using a 40 ft contour intervali purposely did not contour the map to the right. use a 10 ft contour interval. 130 hint: first try drawing the 110 ft contour line. 107 110 134 circle the steepest region in the map above. how did you determine this? give you a place to about the elevation at the 6.