What are the criteria used by geologists to give a semiquantitative measure of the size of an eruption?
A)number of deaths caused by the eruption and the number of buildings destroyed
B)volume of material erupted and height of the eruption plume
C)size of the pre-erupted volcano and the type
D)temperature and pressure during eruption
E)sizes of pyroclastic materials ejected and the distances they travel from the volcano
B
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Is the mass of an atomic nucleus greater or less than the sum of the masses of the nucleons composing it? Why don't the nucleon masses add up to the total nuclear mass?
A. Less. The individual nucleons have greater mass when separated from the nucleus. This additional mass is a result of the energy of separation. B. Neither. The mass of the atomic nucleus is exactly the sum of the masses of the nucleons. C. Greater. The mass of the atomic nucleus also has mass of the "atomic glue" that holds the nucleons together in the nucleus. D. Greater. We need to add the masses of the surrounding electrons to the masses of the nucleons.
In science, a theory is
A. an explanation supported by a substantial body of evidence. B. a tentative explanation, comparable to a hypothesis. C. speculative and unsupported by facts. D. something that can never be proven wrong.
The number of local government units in the U.S. exceeds ________
A) 200 B) 1,000 C) 10,000 D) 20,000 E) 100,000
Whose expedition was able to prove circumnavigation of the globe was possible?
A) Captain James Cook B) Matthew Murray C) Ferdinand Magellan D) Christopher Columbus