Which of the following is the earliest (oldest) chapter of geologic time?
A. Mesozoic
B. Precambrian
C. Paleozoic
D. Cenozoic
Answer: B
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For the following reaction, identify whether the compound in bold is behaving as an acid or a base.H3PO4 + H2O ? H2PO4- + H3O+
A. acid B. base C. neither D. both E. none of the above
Nekton are animals and plants that float passively in the marine environment. Indicate whether the statement is true or false
Charge separation
A) results in the top of the cloud having a negative charge. B) most often occurs in clouds that are not precipitating. C) results in lightning only if the cloud extends above the freezing level. D) is not explained by the thermoelectric effect.
In 1802, the French naturalist ____________________ proposed the first system for classifying clouds
Fill in the blank with correct word.