The average salinity of seawater can be expressed as ____________________ grams per kilogram of
seawater, ____________________ parts per thousand, and ____________________ percent. Fill in the blank(s) with the appropriate word(s).
35, 35, 3.5
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Analyze the map and select the proper response for each missing term or phrase. 
Analyze the map and select the proper response for missing term or phrase for number 1.
A. 15 billion B. 150,000 C. 15 trillion D. 15 million
Which of the following changes to the sun's total energy output will likely occur as the number of sunspots increases?
A. slight decrease B. no change C. alternately increase and decrease above average values D. slight increase
A glacial landform with steep-walled, pyramidal peaks formed by headward erosion of glaciers on at
least three sides is a(n): a. horn. b. esker. c. kame. d. terminal moraine. e. cirque.
The hygiene hypothesis predicts that the lowest levels of asthma should occur in people living in
A) poor rural families in developing countries. B) wealthy families in developing countries. C) poor urban families in developed countries. D) wealthy families in developed countries.