Instructions: Choose the phrase that best answers each question.
1. Which type of current created the sand waves in San Francisco Bay near the Golden Gate (Figure 1)? Hint: these currents move into and out of SF Bay every day.
A) tidal currents
B) rip currents
C) western boundary currents
D) upwelling currents
2. Examine Figure 2. The sediments beneath San Francisco Bay show that
A) The Bay has always been an estuary where mud was deposited.
B) Modern Bay mud is underlain only by river gravel deposited during the last glaciation.
C) The Bay has undergone several cycles of estuary mud and river gravel deposition.
3. Click on Link A1 (under "Sediments below the bay bottom"). Which of the following is NOT listed as an activity resulting in bay contamination?
A) Oil refinery
B) Sewage treatment plant
C) Nuclear power plant
D) Industries and PG&E
4. Click on Link A2 (under "Sediments below the bay bottom"). Which of the following best describes the concentration of DDT in bay sediments?
A) The concentration of DDT was greatest around 1970 and has declined since then.
B) The concentration of DDT is greatest in the youngest sediments (0-50 cm depth).
C) The concentration of DDT was greatest in the 1800s (prior to 1900).
D) The concentration of DDT has remained constant through time.
5. Click on Link B1 (under "Sediments as indicators of global conditions"). In Voyage 4 we examined a figure showing that the zone of high sea-surface temperatures along the equator was wider on the western side of the Pacific Ocean (left side of the diagram), like the Normal Conditions diagram shown on this link page. Look at the diagram for El Niño Conditions. Which of the following statements best describes the distribution of sea-surface temperatures in this diagram?
A) The zone of high sea-surface temperatures (red and yellow colors) is wider on the western side of the ocean (left side of diagram), just as it is in Normal Conditions.
B) The zone of high sea-surface temperatures (red and yellow colors) is wider on the eastern side of the ocean (right side of diagram).
C) The zone of high sea-surface temperatures (red and yellow colors) is about the same width on both the west and east sides of the ocean.
1. Write your review of the article you read about resources, including the components listed in Part II (name and source of article, description of resource, and interesting aspects). Also, bring a copy of your writeup (or notes about the article) to class and be prepared to share what you have learned with others in the class.