Which surface produces the least friction when someone walks on it a. carpet b. ice c. sand d. wood floors

B Ice

The friction depends on the texture of the surface. A rough surface has more friction. The carpet or wooden surface that we usually walk on have fairly enough friction. We don't slip on sand also much but to walk on ice it requires spokes as you also see while doing ice skating it is very difficult to stand on ice. This is because of low friction on ice floor.

that tool is called an altimeter which measures your altitude which can be used to tell which atmosphere you are currently in, including the stratosphere.

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