Question: The change in elevation between contour line A and contour line B is 20 meters. What is the change in elevation between contour line A and contour line C? How do you know that is the change in elevation between A and C?
Reference answer: 40 meters. The change in elevation is 20 meters between A and B and 20 meters between B and C. So the change between A and C is 40 meters. 20 m plus 20 m equals 40 m.

Student answer: 40, Because between each is 20 and if you times 20 twice you will get 40.

Student answer: 40, C is next to B so you add 20 meters to the elevation contour line band A.

Student answer: 40 meters, The contour interval is 20 meters.

Student answer: 225, You keep adding 75.

Student answer: Because it is the its spread apart.

Student answer: 60 meters, Because it said the change in elevation from line A to B is 20 meters so that lets me know to count by 20 meters.

Student answer: 40, Because it is 20 thought A to B and B to C.

Student answer: 283 meters, Because A is higher.

Student answer: 45, Because you can tell by the lines.

Student answer: 25 meters.

Student answer: 30 meters, I measured with my fingers that C was half of B, and since B is 20 and half of that is 10 I added both of them together and got 30 meters.

Student answer: 360, big the line of the A, B, C, D.

Student answer: C, Because it said the change in elevation for A and B was 20 meters and since it 20 they might be counting by 20's so that is my answer.

Student answer: 40, because if it is like then to get to C just add another 20 meters.

Student answer: 30, well because if A and B equals 20 meters and B true C looked like 10 more meters and I think is 30 meters.

Student answer: 30, I know because A and B is 20 meters and B to C is about 10 meters and it is almost close together.

Student answer: 30, because if you could change A on B so you A and C.

Student answer: 40 meters, now I know is if A to B is 20 meters than A to C is 40 because you add another.

Student answer: A, they are closer to each other.

Student answer: 40 meters, Because the contour numbers or lines are counting by 20 meters.

Student answer: 60 meters, you are just doubling it.

Student answer: 60 meters, I labeled them. I also knew C is the third letter in the alphabet so I counted by 20 3 times.

Student answer: 30 meters, Because if you look at A and then C. C get a lower amount by subtracting.

Student answer: 40 meters, I know this because A to B is 20 meters and the next contour line is another 20 meters away it must be 40 meters.

Student answer: Feet, because it has a great space between.

Student answer: 40 meters, I know this because the contour interval is 20 meters.

Student answer: 40 meters, each line goes up 20 meters.

Student answer: 40 meters, It is counting by 20's, 0, 20, 40, 60.

Student answer: 40 meters, It is on an accurate scale.

Student answer: 30, I halved what A and B was.

Student answer: 40 meters, I know this because contour intervals do not change and 20 plus 20 equals 40.

Student answer: 50 meters, It is double the length of B plus 10 meters.

Student answer: 23 meters, I know because all you do is draw a line to line C.

Student answer: 40 meters, I know because the distance between contour lines do not change.

Student answer: 40, I know because the distance between every line is 20, since 20 plus 20 equals 40.

Student answer: 40 meters, I know because the contour line is 20. So since A and B is 20 add 20 more.