Pyroclastic flows move ________
A) as a dense cloud that contains hot magma particles suspended in hot gases and moves rapidly downhill
B) as gravity flows similar to snow avalanches
C) very rapidly, too fast to outrun on foot
D) all of the above
E) none of the above
D
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China and the United States together are the source of nearly 80% of the world's annual greenhouse gas emissions.
Answer the following statement true (T) or false (F)
Monocultures and components of the Green Revolution put more food on the global table. However, it may render agriculture more vulnerable to pests and diseases and thus pose long-term risks of famine
Indicate whether the statement is true or false
Many African countries are heavily dependent on foreign aid and heavily in debt to foreign lenders
Indicate whether the statement is true or false
Which of the following is the definition of an essential amino acid?
A) any amino acid which the body needs for any purpose B) any amino acid which the body needs for proteins synthesis C) any amino acid which the body needs, but which it cannot synthesize D) any amino acid which the body needs and which it must synthesize