In energy conversions such as burning coal to produce heat, ________
A) entropy decreases because heat is used to ignite the coal
B) entropy increases because of heat released in the conversion
C) entropy decreases because of heat released in the conversion
D) entropy is unchanged because heat is used to ignite the coal
B
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The name given to the northern supercontinent was
a. Laurasia. d. Gondwana. b. Laurentia. e. northern Pangaea. c. Baltica
Which of the following statements about soil profiles is true?
a. The B horizon is known as the zone of eluviation. b. The R horizon is a zone of intense leaching. c. The C horizon contains partially weathered parent material. d. The A horizon is the regolith or rock layer.
How many valence electrons does gallium (Ga, atomic no. = 31) have?
A. 1 B. 3 C. 70 D. 6 E. 31
What process would cause the weathering of olivine and subsequent formation of limonite, clay, and ions in solution?
A) physical weathering B) volcanic eruptions C) earthquakes D) chemical weathering