What is the speed of sound in seawater of average salinity at the surface?
A) the same as the speed of light in the same conditions
B) approximately 1,000 feet per second
C) about 1,500 meters per second
D) twice the speed of sound in air
C
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Where is the majority (~80%) of the carbon dioxide that was abundant in Earth's early atmosphere?
A. It is contained with the biomass of plants. B. It is trapped within the glaciers of Antarctica and Greenland. C. It has been lost to space. D. It is chemically tied up in limestone. E. It has radioactively decayed to carbon monoxide.
The inner core is
a. solid. b. liquid. c. gas.
What produces swells?
a. wave trains b. wave refraction c. fully developed sea d. dispersion e. fetch
Conservation tillage is an agricultural method that assures maximum water conservation.
Answer the following statement true (T) or false (F)