1) Using the review books define the following: Contour map (same as topographic map) Contour line Gradient Contour interval Profile Map that shows the shape of an area Lines connecting points of equal elevation Change in elevation over a distance Difference in elevation between two contour lines Shows the changes in elevation from a side view

Aim: How do topographic maps allow us to view an area? Topic: Unit 1 Main Idea: Rules for Topographic Mapping

2) What happens to elevation inside of a contour line? The elevation increases inside of the line. 60 80

3) How do you find the contour interval? Subtract two contour index lines and divide by the number of hops. 70 ft – 10 ft __________ 4 hops 40 25 15 ft 55 80 100 ft

4) When drawing contour lines what two things must they either do? Connect into a circle Touch the edge of the map

5) How do you figure out the highest possible elevation on a topographic map? Figure out the value of the next line then subtract 1. 59 ft 79 ft

6) How do you figure out the lowest possible elevation between two contour lines? Look at the lowest adjacent line then add 1. 11 ft 31 ft

7) What happens to a contour line when it crosses a river? Contour lines bend upstream. The river flows opposite the point of the bend.

8) How do you know if the gradient is steep? B Lines are closer The closer the contour lines, the steeper the gradient.

9) What are some ways to know which way is up on a topographic map? Higher elevations The point of the “V” points up

10) What do hachure lines represent? They show a hole or depression

10) What do hachure lines represent? 59 - 41 ft 19 - 1 ft

11) Why can’t two contour lines cross? One point can’t have TWO elevations.

Can we answer these?

How do we number hachure lines? 60 100 80 100 80