The glacier in this first photo is flowing into a body of water, seen at the very bottom of the photo. As the ice flows into
the water body, flow accelerates to a speed that is greater than the rate at which ice can deform. As a result, crevasses form as
cracks develop in the ice to accommodate the higher flow rate. These crevasses are aligned perpendicular to the ice flow direction;
the ice is flowing toward the bottom of the photo while the cracks extend across the photo from left to right. Crevasses aligned
in this manner are called transverse crevasses.
Accelerated flow rates have also caused the crevasses in this second photo to form, only in this case the accelerated flow is due
to a change in the gradient of the topography underlying the glacier, not because the glacier is flowing into a water body. These
crevasses are also aligned perpendicular to the ice flow similar to the crevasses in the first photo; the cracks run from one side of
the glacier to the other - from one valley wall to the other valley wall, while flow is from the upper right to the lower left. Thus,
these are also examples of transverse crevasses.