Which of the following was common to the eruptions of Vesuvius and Mount St. Helens?
A) Both are composite volcanoes
B) Earthquakes before the eruption
C) Small eruptions of tephra
D) Pyroclastic flows
E) All of these are correct.
E) All of these are correct.
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A cratonic sequence includes both transgressive and regressive phases. Indicate whether the statement is true or false
Water at 4°C will expand when it is slightly
A. cooled. B. warmed. C. both of these D. none of the above
Fertilizer use is least common in
A) Africa. B) the United States. C) Europe. D) Asia.
Atoms of metallic elements can form ionic bonds, but they are not very good at forming covalent bonds. Why?
A) These atoms are too large to be able to come in close contact with other atoms. B) They have a great tendency to lose electrons. C) Their valence shells are already filled with electrons. D) They are on the wrong side of the periodic table.