Mountains
Scarr and Knocknacloghoge
On a map, mountains look like a slice through an onion with many irregularly-shaped rings, one inside the other.
If the mountain is long and narrow, like Scarr, the 'rings' are long and narrow; if the mountain is pyramid-shaped, like Knocknacloghoge, the 'rings' look like triangles.
A mountain will have one or more peaks, where the rings become smaller and smaller, and finally end in a spot height or a trig point.
Notice the way that the heights on the contour lines increase, as the rings get smaller. Why do you think this is ?