________ describes the formation of one or more secondary magmas from a single parent magma
A) Magmatic differentiation
B) Hydrothermal alteration
C) Decompression melting
D) Partial melting
Answer: A
Environmental & Atmospheric Sciences
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The land bridge called Beringia during the last glacial advance about 20,000 years ago allowed animals to be exchanged among which two zoogeographic realms?
A) Neotropic and Nearctic B) Australian and New Zealand C) Palearctic and Nearctic D) Neotropic and Paleotropic
Environmental & Atmospheric Sciences
The purpose of a voltage source is to provide an electrical
A. field. B. energy sink. C. charge. D. pressure.
Environmental & Atmospheric Sciences
Any animal that eats other animals, living or dead, as a source of nutrients:a
ectotherm d. carnivore-scavenger b. endotherm e. herbivore c. carnivore
Environmental & Atmospheric Sciences
The U.S. government allocates approximately ________ percent of its GNI to foreign aid
A) 12 B) 7 C) 2 D) 1 E) 0.2
Environmental & Atmospheric Sciences