How and where do alluvial fans form? What will be an ideal response?
Alluvial fans form best on lowlands with adjacent highlands in arid and semiarid regions where little
vegetation stabilizes the slopes. These areas are prone to hard rains that saturate surface materials.
Surface runoff is funneled into a mountain canyon, but when the runoff reaches the base of the
mountain, it quickly spreads out forming a fan-shaped body of alluvium.
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Which of the following statements regarding transcription and translation is true?
A. mRNA includes the bases A, C, G, and T. B. A codon consists of a sequence of two nucleotides. C. A tRNA molecule includes a codon sequence and carries a single amino acid. D. An RNA transcript may contain sections that are removed before translation.
Eutrophication occurs when
A. fecal coliform bacteria enters drinking water. B. an industry returns heated water to its source. C. point source pollutants enter the groundwater. D. nutrient increase causes excessive aquatic plant growth.
Mudflows of volcanic ash are referred to as ____
a. avalanches b. heavings c. solifluctions d. lahars
Relative to the celestial background, the moon moves ________
A) south to north B) west to east C) east to west D) southeast to northwest