What Would Be the Best Explanation for the Fact That

question 157

Multiple Choice

What would be the best explanation for the fact that most natural water has a pH of about 5.6?

• A)Carbon dioxide reacts with water to form an acid.
• B)Air contains acid rain particles.
• C)Minerals that are dissolved in water are often acidic.
• D)Many salts that dissolve in natural waters make the water basic.
• E)none of the above

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Definitions:

Limestone

A sedimentary rock composed mainly of calcium carbonate, often used in building materials and is a key ingredient in cement.

Tailings

The materials left over after the process of separating the valuable fraction from the uneconomic fraction of an ore.

Ore

A naturally occurring solid material from which a metal or valuable mineral can be extracted profitably.

Metamorphic Rock

Rock that was once one form of rock but has changed to another under the influence of heat, pressure, or some other agent without passing through a liquid phase.