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I think it descended -148
None, if it is a hole.
There is no dirt in a hole
This depends on the specs of the building. In the alternative, it would be 2 times the number of bideps plus 4 times the number of quadripeds plus the number of monopeds whose feet were occupying the space from the surface of the first floor to just below the surface of the second floor.
-10 is 'higher up' on the number line than -15, so it is greater. Think of a thermometer. Which is warmer -10° or -15°. Or suppose you are diving in water. Which is 'higher up' 15 feet below the surface (-15) or 10 feet below the surface (-10).
16 Feet
1,450 feet is fartherfrom the surface
How would I know?
The surface is 1300 feet below sea level
I think it descended -148
The feet help propel a loon below the surface of the water.
None, if it is a hole.
The volume of the balloon would decrease. The pressure of the water would press inward on the balloon and cause it to shrink in volume.
The maximum number of feet that a safety net can be placed directly below the working surface is 30 feet. However, closer is better and the net should be closer if possible.
10 feet under ground
30 feet
Then the surface area of the solid would be measured in square feet