When comparing the strength of two weak acids which factor do we use to determine which is the stronger of the two?
A) the formula weights of the acids
B) the number of protons the acids can lose
C) the values of the pKa's of the acids
D) none of the above
C
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Which of the following is true about transport of sediment in a stream?
A) Pebbles and cobbles are mostly transported by suspension. B) Sediment that is deposited within a stream bed is unlikely to be transported again. C) Sand can be transported in a series of bounces along the stream bed. D) Slower current can carry larger clasts because the water is in contact with each clast for a longer time. E) Sand grains are converted into salt by the process of saltation.
What creates a moraine?
a. Wave-dominated deltas b. Glaciers c. Atolls d. Tombolos
Which of the following best matches the description?Amount of oxygen used by decomposer organisms to degrade organic molecules in aquatic ecosystems.
A. desert B. grassland C. euphotic D. periphyton E. savanna F. pioneer community G. biochemical oxygen demand H. tundra I. pelagic J. deciduous forest K. benthic L. marsh M. littoral zone N. phytoplankton O. boreal forest
Earth's magnetic poles appear to ________.
A. switch positions every 100 years B. quickly move over large distances yearly C. never move D. slowly move around the geographic poles over decades