The central glacier in the figure below once stretched all the way to the farthest ground moraine.What type of glacier was it? 
Definitions:
Improves
To become better or to make something better in quality, value, or performance.
Absolute Threshold
The minimum intensity at which a stimulus can be detected by an individual 50% of the time.
Low Level
Basic or elementary in terms of complexity, often used to describe simple tasks or basic programming functions.
Intensity
The amount of energy in a light wave or sound wave, which influences what we perceive as brightness or loudness. Intensity is determined by the wave’s amplitude (height).
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