Arroyos are a type of:
a. stabilized sand dune
b. playa
c. ephemeral stream channel
d. wind-eroded rock
c
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Part of the gill structure in jawless fish evolved into jaws
a. True b. False
Why are lahars so dangerous?
A) They are the hottest of all lava flows. B) They contain deadly chemicals. C) Hot pyroclastic fragments melt ice and snow; this mixture flows extremely fast. D) They are the most explosive of all volcanic eruptions.
Leaching of minerals from soils, especially calcium, magnesium, and potassium, can be increased when
A) the pH is lowered, especially from acid rain. B) salty irrigation water is used to flush out polluted soils. C) anti-microbial agents and nanoparticles contaminate soils. D) excess chemical fertilizer is used over many years.
Shifting cells of subtropical high pressure contribute to the dry-summer conditions in the Mediterranean dry-summer climates
Indicate whether the statement is true or false