Recessional moraine is the best answer. A moraine is a ridge of till, composed
of the mixture of rocks that were deposited at the front of a glacier while it was
melting. The glacier was once much, much bigger. It then lost mass and the
snout melted back. However, it stopped at the
position of those two people in this
viewLinks to an external site.
. While it stopped at this position for several years,
all of the rock debris that fell onto the glacier was deposited as this ridge of till.
I admit that it is possible that this is an end moraine. An end moraine is the
maximum extent of a glacier. For the end moraine to be the right answer, the
glacier would have had to melt way back (like its present-day position), and then
it would have to re-advance to the position of the people in the view. Please
note -- however -- that end moraine is NOT A CHOICE. I did not include this
choice because it would have made the interpretation unclear. As the choices
now stand, the ridge is not a
(crevasse that separates moving
glacier ice from the snow behind), nor a tarn (lake occupying a bedrock
depression originally eroded by a glacier), nor a
and lee (bedrock hill
eroded by a glacier).