List and distinguish among the four basic compositional groups of igneous rocks
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Felsic composition (granitic) is the richest in silica and lightest in color; it is affiliated with continental crust. The name derives from feldspar and silica. Mafic (basaltic) is richer in iron and magnesium, the elements from which the word "mafic" are derived. It tends toward black in color and is typical oceanic crust composition. Composition between felsic and mafic is termed "intermediate," or "andesitic." Rocks extremely rich in iron and magnesium and poor in silica are termed "ultramafic" and are associated with Earth's mantle.
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A common method of dealing with the radioactive waste at uranium mining and milling sites is to
A. put up warning signs. B. put a fence around the site. C. cover the waste with soil. D. All of these statements are correct. E. None of these statements is correct.
The ultimate cause of jet streams is
a. ?the fact that water can exist in all three phases at once. b. ?ultraviolet energy from the Sun. c. ?the energy imbalance between high and low latitudes. d. ?the instream of cold waters from the poles. e. ?global warming.
Describe the idea of continental drift.
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________________ services serve other businesses rather than consumers directly.
Fill in the blank(s) with the appropriate word(s).