The density of seawater is slightly lower than the density pure water.(T/F)
a. true
b. false
b. false
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What are the amphidromic points of the world ocean, and approximately how many are known to exist?
What occurs as the longshore current drags sediment down a beach?
A. beach drift B. beach refraction C. stream outflow D. organic secretion E. beach transfer
Which of these statements is FALSE concerning estuaries??
A) ?Larvae are often abundant there. B) ?Estuaries are in danger of development and pollution. C) ?Very few autotrophs live in estuaries, but many animals can be found there. D) ?Estuaries are places where saltwater and fresh water meet.
Which of the following is a recent human impact on the nitrogen cycle?
A) the Haber-Bosch process B) nitrogen mining C) introducing legumes into plant rotation D) biological nitrogen fixation E) bacterial nitrification