The principle of ________ is the concept that ancient life forms evolved in a definite order, and therefore, their fossils can help determine the geologic ages of strata
A) superposition
B) cross-cutting relationships
C) fossil succession
D) fossil assemblage
Answer: C
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China's large population has traditionally been supported by
A. a millet-based agricultural system. B. fertile alluvial soils and adequate water for the cultivation of staple cereals. C. an abundance of minerals such as coal. D. the growth of urban areas.
The Earth pulls on the Moon. Similarly, the Moon pulls on the Earth, evidence that
A) Earth and the Moon are simply pulling on each other. B) Earth's and the Moon's pulls comprise an action—reaction pair. C) both A and B
A radioactive isotope in a 9.0 mL vial has an intensity of 300. mCi. How much of the liquid should be injected into a patient to deliver a dose of 50. mCi?
A) 0.9 mL B) 1.5 mL C) 3.0 mL D) 4.5 m
The presence of free oxygen in the atmosphere is attributed mainly to which of the following?
A. volcanic activity B. development of blue-green algae C. formation of the outer core D. formation of the inner core