Why are the deep ocean basins covered with red clay deposits?
a) Red clays are formed from submarine weathering of other sediments.
b) Clay particles are carried to the middle of the oceans by wind and currents.
c) Only the deep ocean has the right pressure, temperature, and oxygen conditions to form red clay.
d) Red clay dominates because of the near absence of other lithogenous and biogenic particles that would otherwise dilute it.
e) Clay is formed at hydrothermal vents, which are found in the deep sea.
Question 2
Which of the following is non-point-source pollution?
a) methyl mercury from an industrial plant
b) oil spill form a cargo ship
c) rain runoff carrying trash into the bay
d) DDT runoff from a farm
e) all of the above
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