An igneous rock in which large mineral grains called ____________________ are suspended in a
finely crystalline groundmass is called a(n) ____________________. Fill in the blank(s) with the appropriate word(s).
phenocrysts, porphyry
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A 10-kg brick and a 1-kg book are dropped in a vacuum. Acceleration of the 10-kg brick is
A. the same as that of the 1-kg book. B. zero. C. 10 times that of the 1-kg book. D. 5 times that of the 1-kg book.
Why is the SOFAR layer efficient for sound travel?
a. Refraction causes the sound energy to remain within the layer. b. The density of the SOFAR layer traps the sound energy. c. Sound energy bends away from layers of lower sound velocity. d. Temperatures and salinity conditions are homogeneous. e. Sound travels rapidly in this layer.
Tornadoes are most frequent during the:
A) October-December period. B) month of September. C) July-August period. D) April-June period. E) January-March period.
The concept of regions in geography is useable because
a. all regions are countries. b. all regions are very large. c. it allows for an exact study of given area for a specific purpose. d. regions are the only way that computers can be used with geographic data and follow political lines. e. regions are just another name for our seven continents.