Is carbon-14 an appropriate isotope for dating the metamorphic rocks at the bottom of the Grand Canyon? Explain
What will be an ideal response?
Answer: No, it's not. The rocks at the bottom of the Grand Canyon are igneous and metamorphic, and they are also really, really old. Carbon-14's usefulness is limited to living things (which consume carbon-14 every time they photosynthesize or eat) from the relatively recent past (because carbon-14 has such a short half-life, it decays very quickly over geologic time).
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Why has integrated waste management been criticized?
A) overemphasis on recycling B) results of waste reduction averaging less than 10% C) goals that are incompatible with environmental protection D) overregulation of hazardous wastes
An area defined by characteristic, long-term weather patterns is called
A) an ecosystem. B) a climatic region. C) a biome. D) an average weather place.
Not all jet streams form at the tropopause
a. True b. False
The iron in banded iron formations is found in this form:a
iron sulfides d. iron carbonates b. iron oxides e. none of the above c. iron silicates