Lakes Lying in Granite Basins,such as Those in the Northeastern

question 127

Multiple Choice

Lakes lying in granite basins,such as those in the northeastern U.S.,tend to become acidified by acid rain more readily than lakes lying in limestone basins,such as those found in the midwestern U.S.Why is this so?

• A)The granite contains acidic minerals that dissolve in the rain water and are added to the lakes.
• B)Since the acidified water cannot percolate through the granite,the acid in the lakes becomes more concentrated.
• C)The limestone,which is calcium carbonate,serves to neutralize the acid in the rain.
• D)There is more acid rain in the northeast than in the midwestern regions of the U.S.

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Definitions:

Recent Data

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Smoothing Calculation

A mathematical process used to remove short-term fluctuations and highlight longer-term trends or cycles in data sets.

Cyclical Component

A pattern in a time series data set that occurs at regular or predictable intervals, often related to economic cycles.

Periodic Fluctuations

Systematic variations within a time series data that occur at regular intervals over time.