What percent of a parent radioactive element would remain after three half-lives of decay to its daughter isotope?
A. 12.5
B. 50
C. 75
D. 25
E. 6.25
Answer: A
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What type of storm is the principle cause of weather in the mid-latitude regions?
a. extratropical cyclones b. single air mass disturbances c. air mass divergences d. cyclones e. frontal storms
What evidence demonstrates the resilience of the Indian cultures in Latin America?
A) Amerindian majorities in all countries of Latin America B) a thriving Amerindian movie industry C) architectural ruins D) the survival of Amerindian languages in the region E) the presence of Indian-run gambling casinos throughout the region
Use the diagram below to answer the questions that follow.
Which represents rocks that formed before A but after E?
A. G B. F C. C D. D E. E
A tributary that is physically unable to join the main channel on a floodplain due to natural levees is called a
A) alluvial stream. B) meandering tributary. C) levee tributary. D) yazoo tributary.