The hot air balloon's(above the eagle) elevation, relative to sea level is 98 meters
Elevation is the height to which something is elevated or to which it rises.
Therefore,
The eagle circle 48 meters above the mouse that scurried in the valley. The valley is 16 meters below sea level.
At the same time a hot ballon floated 66 meters above the eagle.
Therefore, the hot air balloon's elevation, relative to sea level is as follows;
elevation = 66 + 48 - 16 = 98 meters
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