Geologists divided the Earth's history into the following eons:
a. Hadean, Archean, Proterozoic, Phanerozoic
b. Paleozoic, Mesozoic, Cenozoic
c. Cambrian, Ordovician, Silurian, Devonian
d. Tertiary, Quaternary, Phanerozoic
Answer: a. Hadean, Archean, Proterozoic, Phanerozoic
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A) planetary compression theory B) protogalactic theory C) extrastellar solar hypothesis D) nebular hypothesis
An important principle in one of the theories of the electrification of clouds is that
a. ?there is a net transfer of negative ions from a warmer object to a colder object. b. ?supercooled water is always negatively charged. c. ?ice crystals are always negatively charged. d. ?there is a net transfer of positive ions from a warmer object to a colder object. e. ?raindrops are always positively charged.
After a problem is identified, the next step in the policy cycle is to
A. Implement policy B. Set an agenda C. Suggest changes D. Build support for the problem E. Develop proposals
Most people in Asia, Africa, and Latin America have become commercial farmers
Indicate whether the statement is true or false.