Answer and Explanation:
Stress is pressure per unit area applied to a rock or solid.
Strain is the deformity or change in dimension of the rock as a proportion of the original dimension thus being a dimensionless quantity.
<span>True, however 50% is rather optimistic value, it's probobally more. The main source of water is in the ground and the groundwater gets constantly more contaminated with road salt, oil, gasoline and other chemicals (and as you can see, these are all manmade products).</span>
