The Challenger expedition (1872-1876 ) was a unique and historic voyage. Why?
A) ?It is the longest continuous scientific oceanographic expedition on record.
B) ?Its scientists developed the first reliable navigational charts to indicate current and wind patterns.
C) ?It was the first expedition to use an echo sounder to study the seafloor.
D) ?It proved the hypothesis that life could not exist in the deep sea.
A
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Air that does not resist vertical displacement is called ________.
Fill in the blank(s) with correct word
Which would you expect to be more viscous, a polymer made of long molecular strands or one made of short molecular strands? Why?
A. short molecular strands because of a greater density B. long molecular strands because of a greater molecular mass C. long molecular strands because they tend to tangle among themselves D. short molecular strands because their ends are typically polar
Which of the following is an adaptation to living in a desert?
A. Being active during the day B. Large, flat leaves C. Seeds that can lie dormant for long periods D. Shallow root systems
This diagram features a
A. anticyclone, southern hemisphere. B. anticyclone, northern hemisphere. C. cyclone, southern hemisphere. D. cyclone, northern hemisphere.