New ocean crust forms at which is a plate boundary

new ocean crust forms at ocean ridges which is a Tectonic plate boundary.

Explanation:

At mid-ocean ridge magma arrives out of the crack, cools and solidifies and builds the new oceanic crust, fresh oceanic crust pushes the old oceanic crust into a ditch in a range known as a subduction zone.

Effects of tectonic plates are following:

X is located at 640ft in elevation.

The western side is steeper because the lines are closer together than the other sides of the hill.

Explanation:

Each contour line represents a 20ft increase in elevation. You can see the 600ft line labeled on the map, so the next one in is 620, and the one labeled "X" is 640.

Contour lines that are farther apart indicate a more gentle slope that is increasing its height over a longer distance. Just like a graph in math class, slope is "rise over run," so a flatter slope tells us that the height is increasing slowly. Close contour lines show us that the height is going up very quickly.