How long did the process of density stratification of Earth last?
a. 100 million years
b. 100 thousand years
c. 10 billion years
d. 1 billion years
e. 50 million years
a
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Urbanization influences soil erosion processes primarily because of
A) increased runoff from impermeable surfaces B) increased soil pollution from street runoff C) vegetation removal and soil disturbance at construction sites D) desiccation of soils through draining and pumping of water
Answer the following statement(s) true (T) or false (F)
1. Concerning energy use, “getting more” is challenged by the difficulty of changing individual habits 2. Release of carbon dioxide from the burning of fossil fuels is the biggest and best known contributor of greenhouse gases. 3. Increase in “ozone hole” leads to increase in skin cancer rates. 4. A 2006 study found that over 160,000 Americans die prematurely each year due to fine particulates.
During December solstice the
A. entire area poleward of the Tropic of Cancer remains out of sunlight. B. entire area poleward of the Tropic of Capricorn remains out of sunlight. C. entire area poleward of the Antarctic Circle remains out of sunlight. D. entire area poleward of the Arctic Circle remains out of sunlight.
On this date the length of daylight get progressively longer going south from the equator
June 21 March 21 September 21 December 21