Why is there a difference between a lunar day and a solar day?

Unlike a 24-hour solar day, a lunar day lasts 24 hours and 50 minutes. This occurs because the moon revolves around the Earth in the same direction that the Earth is rotating on its axis. Therefore, it takes the Earth an extra 50 minutes to ''catch up'' to the moon.
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Asmall closed hole formed in an outwash plain or moraine. forms when a  glacier retreats then remains stationary. 

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