Which atmospheric gas is closely linked to the greenhouse effect?
A) ozone
B) carbon dioxide
C) methane
D) chlorofluorocarbons
E) nitrous oxide
B) carbon dioxide
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Air pressure decreases with elevation primarily because the temperature of the air is lower at higher elevations
Indicate whether the statement is true or false
How do scientists use lake sediments to study past climates?
A) Lake sediments contain organic materials that can be identified to species and radiocarbon dated, thereby giving insight into past plant communities and related climatic conditions. B) Isotopic analysis of the relative proportions of 18O to 16O enable determination of evaporation rates from ancient lakes. C) During warmer conditions, lake sediments form wider rings, whereas in cooler conditions, these rings are narrower. D) The amount and type of pollen in lake sediments is an indication of the macrovertebrate assemblages that dominated an area. E) Lake sediment analysis is used to determine which fish species have persisted in a particular lake over long periods of time.
How has passage of the North American Free Trade Agreement (NAFTA) altered the political economy of MexAmerica during the past decade or so?
What will be an ideal response?
A dissolved oxygen minimum layer occurs in the ________ zone
A) abyssopelagic B) bathypelagic C) epipelagic D) mesopelagic E) nektopelagic