Natural sources of air pollution come from ________
A) soil dust, wildfires, and volcanic dust
B) evaporation of solvents
C) internal combustion engines
D) birds
E) coal-fired electrical plants
A
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Which of the following is the root cause of food insecurity?
a. insufficient food resources being produced globally b. rapid climate change c. Poverty d. political disputes over natural resources e. poor organization of government agencies
Why does graphite feel slippery to the touch?
A) Graphite is soft and easily crushes into powder. B) Graphite atoms have many free electrons. C) Graphite absorbs water from the air so the surface always feels slippery. D) The carbon atoms in graphite are spaced closely together.
The ____________ ____________ is the energy that tries to flatten a wave. Fill in the blank(s) with the appropriate word(s)
Which of the following minerals has a metallic luster?
A) quartz B) galena C) diamond D) halite