Surface runoff is confined to troughlike depressions of various sizes in channel flow. Indicate whether the statement is true or false
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According to most estimates, Earth is approximately
A. 4.6 million years old. B. 4.6 thousand years old. C. 4.6 billion years old. D. 4.6 trillion years old.
Secondary air pollutants are formed by
A) the evaporation of solvents and gasoline. B) the incomplete combustion of fuels. C) primary pollutants reacting with other compounds in the atmosphere. D) radioactive substances such as radon reacting with primary pollutants.
Santa Ana winds
A) are not associated with pressure gradients in the way other winds are. B) create wildfire conditions by bringing heat and dryness as they flow southwest. C) flows from lower to higher elevation, expanding and cooling in the process. D) bring cool, moisture-laden air from the east to the southern California coast.
Earthquakes in subduction zones generally only occur at depths of
A. up to 700 km. B. 700-1000 km. C. greater than 700 km.