What is the wavelength of an electromagnetic wave that has a frequency of 3 kHz?
A) less than 1 km
B) 1 km
C) more than 1 km
C
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An example of kinetic energy is
A. a battery. B. a stick of dynamite. C. a pile of leaves. D. a falling rock. E. the chemical energy in a candy bar.
Which of the following decrease(s) photosynthesis in bodies of water?
a. disease-causing organisms b. inorganic plant nutrients c. sediment such as soil or silt d. heat e. organic chemicals
This water balance diagram for the tropical location below suggests that
A. the soil seldom reaches the wilting point. B. the soil reaches field capacity in December or January. C. drought is not a real concern. D. All of these.
Which of the following is true of the chemical composition of seawater?
A) The highest salinity values of seawater are found near landmasses and at higher latitudes. B) The chemical properties of seawater show very little latitudinal variability, though some minor variability with depth. C) Eighteen elements account for 75% of the dissolved matter in seawater. D) Samples of ancient seawater suggest a great deal of chemical variation over the Earth's history. E) Seawater contains dissolved gases, suspended and dissolved organic matter, and many trace elements.