Global temperature trends can be inferred from changes in ________ and ________
A) fossils; hydrogen and oxygen isotopes found in sediments and glacial ice
B) volcanic eruptions; isotope ratios in glacial ice
C) fossils; chemical isotopes found in sediments and glacial ice
D) volcanic eruptions; fossils
E) fossils; isotope ratios in glacial ice
C
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Atoms of a particular element that have a different number of neutrons in their nuclei are called
______. Fill in the blank(s) with the appropriate word(s).
Azeris are ________ who speak an Altaic language, but Armenians are Christians who speak an Indo-European language
A) Serbs B) Muslims C) Baptists D) animists E) Hindus
At low (tropical) latitudes, phytoplankton blooms are typically most limited by ________.
A. temperature B. nutrients C. light D. grazing
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.