How would we use isotopic ages to infer the ages of the upper and lower unit in this diagram?
A. An age on the dike would not help us because it is an igneous rock.
B. The upper unit would be older than an age determined on pebbles of the dike in that unit.
C. The dike is younger than the lower unit but older than the upper unit.
D. The lower unit would be younger than an age on the crosscutting dike.
Answer: C
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Humidity is a measure of the amount of water vapor in the atmosphere. The humidity is always very low inside your kitchen freezer because
A. the frost in the freezer absorbs this moisture B. it is not possible for water to be in the gaseous phase at temperatures below 0°C C. at the cold temperatures water molecules in the vapor phase are moving relatively slowly. D. the kitchen freezer is most often sealed off from the atmosphere
Which of the following is a characteristic of a perfect pesticide?
A. is inexpensive B. affects only target organisms C. a short life D. All of these are correct.
The bottom of the euphotic zone is where
1.there’s no more light at all, unmeasurable.
2.there’s insufficient light for any photosynthesis to occur.
3.use of carbohydrates in respiration equals their photosynthetic production.
4.phytoplankton respiration is zero.
Deep-well injection of hazardous wastes has the advantage that
A) it falls under the umbrella of the Superfund Cleanup (SARA). B) injected materials can easily be recovered for further treatment. C) solids, liquids and gases can be disposed with this technology. D) the deep-injected liquids should not contaminate ground water or surface ecosystems.