1
Marks: 1
According to Figure 1, the seawater's salinity at the point when 25% of the seawater column had evaporated would most likely be:
Choose one answer.
	 a. between 35 g/L and 60 g/L.
	 b. less than 35 g/L.
	 c. between 60 g/L and 80 g/L.
	 d. greater than 80 g/L.

2
Marks: 1
If Figure 2 is typical of evaporite deposits, the greatest thickness of any evaporite deposit will be composed of which 2 evaporites?
Choose one answer.
	 a. NaCl and CaCO3
	 b. Bittern salts and CaSO4·2H2O
	 c. Bittern salts and NaCl
	 d. CaSO4·2H2O and CaCO3


3
Marks: 1
According to Table 1, which of the following figures best represents the densities of CaCO3, NaCl, KI, and MgI2?
Choose one answer.

(Chris: something was wrong with this, i couldnt see the graphs)
	 a.

	 b.

	 c.

	 d.

4
Marks: 1
Which of the following statements about the onset of significant evaporite precipitation is supported by the data in Figure 1? Significant evaporite precipitation begins:
Choose one answer.
	 a. when approximately 25% of the seawater has evaporated.
	 b. as soon as seawater first begins to evaporate.
	 c. when approximately 50% of the seawater has evaporated.
	 d. as soon as seawater is completely evaporated.

5
Marks: 1
Which of the following statements about the precipitation of evaporites is supported by the data in Figure 1 and Table 1? The first evaporite to precipitate out of seawater is the evaporite with the:
Choose one answer.
	 a. lowest solubility.
	 b. highest density.
	 c. highest solubility.
	 d. lowest density.