The oldest well-documented stromatolites occur in the ____
A)Hadean
B)Archean
C)Paleoproterozoic
D)Mesoproterozoic
E)Neoproterozoic
B
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What is VEI? What will be an ideal response?
There are many different strategies for reducing anthropogenic emissions of carbon. Determine whether the given strategy is an example of 1) energy efficiency and conservation; 2) a change in energy source; 3) a change in transportation energy source; or 4) an increase in natural carbon sinks.A recently passed law requires that, by the year 2020, at least 20% of the new cars sold in the country of Gotlandia must run on biofuels.
A. Energy efficiency and conservation B. Change in energy source C. Change in transportation energy source D. Increase in natural carbon sinks E. This is not a strategy to reduce carbon emissions
Since Canada closed the Grand Banks in 1992, fish populations have rebounded to historical levels
a. True b. False Indicate whether the statement is true or false
Which process produces relatively pure deposits of gravel, sand, and clay?
A. Hydraulic sorting B. Hydrothermal activity C. Regional metamorphism D. Crystal settling