By how much has Earth's atmospheric CO2 concentration increased since the year 1800?
What will be an ideal response?
389 ppm – 280 ppm = 109 ppm (answer written in 2009)
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Supernovae are one of the most extreme events in the known universe. They are caused by
A. the collapse of a supermassive supergiant star. B. the implosion of a white dwarf, which has run out of all its fuel. C. a supermassive supergiant star undergoing a massive nuclear chain reaction. D. any of the above
Higher organic matter content in the soil imparts a blackish coloration to the soil.
Answer the following statement true (T) or false (F)
If a subdivision in the northern United States is built by clearing several portions of a large wooded region, we might see an increase in the
A) number of jays or cowbirds in the region. B) number of songbirds in the region. C) biodiversity in the region. D) number of large-sized species with slower individual growth.
What is the name of the school that is closest to the summit and in a lahar area? What is the distance from the summit to the closest school? What is the vertical relief from the summit to the closest school?
What will be an ideal response?