What is plankton?
a. Any photosynthetic organism
b. An internal organism
c. A drifting organism
d. Microscopic organism
ANS: C
Plankton are very weak swimmers. They are dependent on waves and currents for movement. There is
a large diversity of plankton. Information can be found in the section Plankton Drift in the Ocean.
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How many oxide ions (O-2) are needed to balance the positive charge of a titanium ion (Ti+4)?
A. 6 B. 3 C. 2 D. 1 E. 4
How do mineral substitutions occur?
A) If minerals deep within the Earth's surface melt, elements may mix together and substitute within mineral structures. B) If minerals in water dissolve, elements may mix together and substitute within mineral structures. C) Elements that do not have similar ionic charge or size often attract each other and substitute within mineral structures. D) Elements with similar ionic charge, size, or both substitute for each other within mineral structures.
Which statement about why exchange rates fluctuate is FALSE?
A) Increased demand for foreign currency raises the exchange rate of the exporting country. B) Rising inflation in a country will depreciate its currency; which will make its products more attractive to its trading partners. C) An increase in demand for foreign goods decreases domestic demand and depreciates currency. D) If domestic interest rates rise, that country's currency may depreciate. E) Currency speculation affects exchange rates.
If global warming destabilizes methane hydrates in polar regions, this might lead to increased greenhouse-effect heating.
Answer the following statement true (T) or false (F)