Light colored silicates have a specific gravity of about 2.7 grams/cm3 are composed primarily of the silica tetrahedra and ________
A) potassium, aluminum, magnesium, and sodium
B) potassium, calcium, sodium, and aluminum
C) magnesium, aluminum, sodium, and calcium
D) iron, magnesium, calcium, and sodium
E) aluminum, magnesium, calcium, and iron
B
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Commuting costs in America have declined substantially over the last decade
Indicate whether the statement is true or false.
Measurements of corals in the Caribbean to determine sea level rise and fall are hampered by
A) difficulties with carbon-dating methods due to the way that corals incorporate carbon into their shells. B) a lack of knowledge about how much tectonic uplift and subsidence have occurred. C) difficulties in finding all remaining corals buried in sediment. D) changes in the sea due to local weather conditions.
Compared to less resistant rocks, rocks that are more resistant to weathering tend to form ____
a. valleys b. cliffs c. regolith d. talus
What are the high-relief coastlines shaped by glaciation?
A. baymouth bar B. ria shoreline C. glacial troughs D. fjorded coasts E. drowned estuary