Two layers of sediment representing one year of deposition in a lake, are called a varve.
Answer the following statement true (T) or false (F)
True
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Emergent coasts form when ____
A)deposition is greater than erosion B)land subsides or sea level falls C)land subsides or sea level rises D)land rises or sea level falls E)rivers dump larger volumes of sediment into the ocean
Sea-level pressure near the center of a typical hurricane is about ________ than the average sea-level pressure
A) 150 mb less B) 50 mb less C) 50 mb more D) 150 mb more
Hypoxia, or low-oxygen conditions, is generally considered to occur when oxygen in the water drops to ________ ppm.
A. 10 B. 5 C. 2 D. 15 E. 0
Viscous magmas are stored as a mostly solid, crystalline mush. It can be activated by which of the following?
A. a massive increase in spreading center rates B. an injection of new, hot magma and fracturing by fault movements that connect to isolated magma bodies and reduce the pressure C. fracturing by fault movements that connect to isolated magma bodies and reduce the pressure D. an injection of seawater E. an injection of new, hot magma