How Does Most Calcium-Magnesium Carbonate Rock Form

question 9

Multiple Choice

How does most calcium-magnesium carbonate rock form?

• A)in salt lakes and evaporite basins of continental interiors
• B)by diagenetic replacement of Ca by Mg in limestone
• C)from volcanic hot springs in the deep sea
• D)by direct precipitation from seawater but dolomite selectively dissolves so most carbonate sedimentary rocks are limestone

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