List the top four gases that make up the air in the lower 50 miles of Earth's atmosphere and give their concentrations
What will be an ideal response?
Nitrogen (78%), Oxygen (20.9%), Argon (0.934%), Carbon dioxide (0.040 %)
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An element has two different isotopes: one that weighs 65 amu and another that weighs 67 amu. If the average atomic mass of all the isotopes is 66.5 amu, what can be said about the relative abundance of the isotopes?
A. All the isotopes have the same relative abundance. B. The isotope with the mass of 66.5 is more abundant than the isotope with the mass of 67. C. The isotope with the mass of 66.5 is more abundant than the isotope with the mass of 65. D. The isotope with the mass of 67 is more abundant than the isotope with the mass of 65. E. The isotope with the mass of 65 is more abundant than the isotope with the mass of 67.
The major reason European countries engaged in building large empires was to
A) expand their country's borders. B) work cooperatively with indigenous peoples to learn new agricultural techniques. C) protect their commercial investments in foreign lands and to control the markets. D) import cultures from other areas into Europe.
Complete the following concept map.
Complete the following concept map for number 3.
A. Biochemical B. Chemical C. Clastic D. Evaporation
The major source(s) of chlorofluorocarbons (CFCs) in the atmosphere was/were ________
A) combustion of fossil fuels B) burning of fossil fuels and coal C) microbial fermentation of organic matter in coal mines, oil wells, and livestock D) refrigerants, solvents, and spray propellants E) emissions from automobile exhaust and chemical fertilizers