A floating object oscillates up and down two complete cycles in 1 s as a water wave of wavelength 5 m passes by. The speed of the wave is
A) 2 m/s.
B) 5 m/s.
C) 10 m/s.
D) 15 m/s.
E) none of the above
C
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What type of charge is carried by the biologically active portion of bile salts?
A) negative B) none C) positive D) It varies from one bile salt to another.
The time needed for a typical atom in an oceanic plate to complete a plate-tectonic cycle is ________ years.
A. about 10 million B. about a million C. about a hundred thousand D. less than 500 E. in excess of 250 million
During the history of the earth there have been periods when all the continents were together in a supercontinent
Indicate whether the statement is true or false
Which biome in northern Eurasia has the largest amount of land area predicted to be affected by warming between 5 and 6.5 degrees C?
a. Boreal forests/taiga b. Temperate coniferous forests c. Rock and ice d. Temperate grasslands, savannas, and shrublands