According to Bowen's reaction series, crystal settling should result in the magma being separated in
lower layers rich in the early-formed ____________________ minerals, and upper layers enriched in
later-formed ____________________ minerals Fill in the blank(s) with the appropriate word(s).
mafic, felsic
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In the middle of the eighteenth century in Europe, peasant agriculture was characterized by
A) communal farming practices borrowed from Russia. B) an ever-tightening grip by feudal landlords on the peasants. C) crop rotation that increased yields and soil fertility. D) the first use of the tractor.
What kind of volcano erupts runny lava?
A) cinder cone B) composite C) shield D) basaltic
Colony collapse disorder
A) affects ant colonies, leaving most of the workers dead in the hive. B) has been traced to poisoning by organophosphate pesticides. C) is thought to be caused by a combination of pesticides, pathogens, hive pests or other synergistic toxic chemicals affecting honey bees. D) is not a threat to U.S. crops because other unaffected pollinators will replace ants and bees.
A radiation fog is likely to form during the occurrence of a ground inversion
Indicate whether the statement is true or false