Select all of the answers that apply.

Question

Some rules to remember when reading topographic maps are _____.

points inside a contour line are a higher elevation than the contour line
strike-and-dip symbols indicate the degrees of tilt of rock strata
the elevations of contour lines must always be whole number multiples of the contour interval
the thin line separating two different rock units is a contact line

Answer 1

The following answers apply when reading topographic maps:

1. Points inside a contour line are a higher elevation than the contour line - This is true; any point within a contour line is at a higher elevation than the contour itself.

2. Strike-and-dip symbols indicate the degrees of tilt of rock strata - This is also true; these symbols are used to represent the orientation of rock layers.

3. The thin line separating two different rock units is a contact line - This statement is true as well; contact lines show the boundary between different geological units.

The statement about the elevations of contour lines must always be whole number multiples of the contour interval is generally accepted for most maps, but it is not an absolute rule as different maps may use varying intervals. Therefore, this statement may not necessarily apply in all cases.

In summary, the first three statements are correct.