Chalk forms from ________
A) evaporation of magnesium rich waters
B) magnesium rich fluids that chemically alter limestone bearing reefs
C) the hard parts of microscopic organisms that accumulate on the sea floor
D) direct precipitation from seawater
C
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Excluding Greenland and Antarctica, forests cover about 31% of the earth's land.
Answer the following statement true (T) or false (F)
How many grams of sodium chloride are needed to make 15 L of a solution that has a concentration of 3.0 g per liter of solution?
A. 5 g B. 30 g C. 45 g D. 141 g
Of seconds, degrees, and minutes of latitude, minutes are associated with the shortest distances
Indicate whether the statement is true or false.
The Antarctic Protection Act of 1990
A. establishes guidelines for mineral-resource development in Antarctica. B. sets the maximum allowable levels for Antarctic air and water pollution. C. protects the Antarctic flora and fauna. D. prohibits Antarctic mineral prospecting and development by United States citizens and companies.