1-choose any two points on the line.
2-draw a right-angled triangle with the line as hypotenuse.
3-use the scale on each axis to find the triangle's: vertical length.horizontal length.
4-work out the vertical length ÷ horizontal length.
5-the result is the gradient of the line.
Try D. Tectonic plates are pushed apart partly due to convention currents
Answer:
its the world's longest unfortified border :))
