What are the three main sources of meteoroids?
What will be an ideal response?
(1) Interplanetary debris that did not get incorporated by the planets during the formation of the solar system
(2) Material being ejected from the asteroid belt
(3) The rocky and/or metallic remains of comets that once passed through Earth's orbit
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How much did the concentration of CO2 (ppm) in the atmosphere increase from 1960 to 2010?
A. 75 ppm B. 25 ppm C. 40 ppm D. 105 ppm
Basic principles of commercial and industrial location are based on
A) access to suppliers. B) proximity to markets. C) the availability of labor. D) processing costs. E) access to suppliers, proximity to markets, the availability of labor, and processing costs.
The mass of an atom of 12C is exactly 12 atomic mass units. Which of the following describes a mole of 12C atoms?
A) a sample which contains 6.02 x 10^23 atoms of 12C B) a sample which weighs exactly 12.011 grams C) both a and b D) neither a nor b
All of the following could increase the risk of landslide on a slope except
A. adding fill at the top of the slope to build a road. B. building a house on the slope. C. use of septic tanks. D. planting shrubs with extensive root systems.