An important condition for the formation of coal is ________
A) abundant plant and animal life in a region
B) acid rich waters that reduce the organic matter to pure carbon
C) decomposition of organic matter with abundant oxygen
D) incomplete decomposition of organic matter due to a lack of oxygen
D
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What percentage of parent isotope is remaining if 1 half life has elapsed?
- 6.25%
- 12.5%
- 25%
- 50%
- 100%
Most migrants to the United States during the peak of the late nineteenth century came from which parts of Europe?
A) Balkan Peninsula B) Scandinavian Peninsula C) Great Britain D) Italy and Greece E) European Russia
A water-filled paper cup held in a flame will not catch fire because
A. the paper cup cannot become appreciably hotter than the water it contains. B. the inside of the paper is wet. C. paper is a good conductor of heat. D. water is an excellent conductor of heat.
If a particular reactant is involved in the slowest step of a multi-step reaction what will be the effect of increasing its concentration?
A) The reaction rate will decrease. B) The reaction rate will increase. C) The reaction rate will be unaffected.