Over what time span does a typical cinder cone form?
What will be an ideal response?
Most cinder cones are produced by a single, short-lived eruptive event. One study found that half of all cinder cones examined were constructed in less than one month and that 95 percent formed in less than one year.
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____________________ has a mix of different combustible hydrocarbons that must be separated in order to be used.
Fill in the blank(s) with the appropriate word(s).
When did the area shaded yellow come into existence in the American city?
A) pre -1888, prior to the advent of streetcars
B) 1945 to present day, as freeways became a common urban feature
C) the area in yellow is zoned for future urban growth in the 21st century
D) 1920-1945 as the automobile became a common mode of transport
E) between 1888 and 1920 when streetcars were heavily used
The source of phosphate in the phosphorous cycle is the atmosphere.
Answer the following statement true (T) or false (F)
In North America "no till farming" has become a widespread practice made possible by genetically modified (GM) crops that can be sprayed with herbicide that kills everything but the GM plant
Evaluate the following statements on the role of GM crops on soil conservation issues? A) The herbicides kill beneficial plants and animals and eventually will make the soil sterile. B) The no till practice dramatically improves soil conservation by providing loose organic matter cover to the soil surface, breaking up wind and runoff, lowering erosion rates. C) They are a disaster. By killing all plants except the GM organism they expose the soil to increased erosion. D) They have no effect one way or the other on soil erosion.