Negative force
The woman is applying force to stop the child or to prevent him from running.
I hope this helps...
The given above pretty much states already that with the presence of the calcium carbonate which acts as the buffer will allow the solution to withstand changes in acidity. The greater the amount, the higher chances that it will be able to withstand the said changes. Therefore, if Lake X had greater ppm of CaCO3 then, it will be able to withstand greater amount of acid rain.
The correct answer is: [A]: "<span>points with the same elevation" .
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