Crevasses can form in several different ways. Transverse <answer>crevasses</answer> are transverse to flow and form where steeper slopes cause a glacier to accelerate. Longitudinal <answer>crevasses</answer> form semi-parallel to flow where a glacier expands laterally. Marginal <answer>crevasses</answer> form from the edge of the glacier, due to the reduction in speed caused by friction of the valley walls. Marginal <answer>crevasses</answer> are usually largely transverse to flow. Moving glacier ice can sometimes separate from stagnant ice above, forming a bergschrund. Bergschrunds resemble <answer>crevasses</answer> but are singular features at a glacier's margins.
What do bergschrunds resemble?
crevasses