A half-life is defined as half the time it takes for a group of parent isotopes to decay to daughter isotopes.
Answer the following statement true (T) or false (F)
False
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Exposure to lead continues to cause unsafe levels in children in the United States. The source(s) of this lead is
a. peeling lead-based paint in houses b. Lead leaching from old water pipes c. Coal burning power plants d. Waste incinerators e. all of these answers
Large-scale human impacts on the climate may have started how long ago?
A) only 200 years ago B) 2,000 years ago C) 8,000 years ago D) 100,000 years ago
What was the chief reason for people to leave farms and move to urban areas during the 1800s?
A. low market prices for farm products B. several years of drought C. factories required a supply of labor D. None of these are correct
Most earthquakes occur at depths of
A. 100-700 km. B. greater than 100 km. C. less than 100 km.