Using the data in this table, calculate the number of half-lives that have passed for the dike (unit D on this table).
A) 1
B) 2
C) 3
D) 4
E) 5
A) 1
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Water use in the High Plains (Ogallala) aquifer system has been severely constrained by a series of restrictive state and federal laws to reduce pumping.
Answer the following statement true (T) or false (F)
About 70% of additional energy added to the earth has been stored in the oceans.
Answer the following statement true (T) or false (F)
The energy source of tropical cyclones is the
A) latent heat of water. B) strength of equatorial winds. C) cold ocean currents near the western edges of continents. D) force of descending air. E) rotation of the Earth.
Hydrothermal vents are considered both a source and sink for ocean salts. How can one factor both add and take away salt?
a) As water interacts with hot rock, some materials are dissolved whereas others are deposited. b) Due to random variations in chemical reactions, salts are both deposited and dissolved in the vents. c) The dissolved material cycles round and round in the vents, first being precipitated and then dissolved, then repeating again and again. d) Hot vents give off material first as gas, which precipitates salt, only to be dissolved by fluids moving through the vent plumbing. e) The statement is incorrect. Hydrothermal vents are only a source for salts, not a sink.