Which of the following is true of the chemical composition of seawater?
A) The highest salinity values of seawater are found near landmasses and at higher latitudes.
B) The chemical properties of seawater show very little latitudinal variability, though some minor variability with depth.
C) Eighteen elements account for 75% of the dissolved matter in seawater.
D) Samples of ancient seawater suggest a great deal of chemical variation over the Earth's history.
E) Seawater contains dissolved gases, suspended and dissolved organic matter, and many trace elements.
E
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What is the likely source of methane in Mars atmosphere?
A) Mars landings of exploration vehicles such as Spirit B) ongoing volcanic activity C) the decomposition of the residue deposits left from Mars oceans D) the absorption of Phobos' (Mars' larger, inner moon) methane atmosphere through gravitation
Permeability is the physical force that pushes water below the water table through a porous, rock material.
a. true b. false
A solution with a pH of 3 is ________ a solution with a pH of 5
A) 4 times less acidic B) 4 times more acidic C) twice as acidic D) half as acidic E) 100 times more acidic
The rock formations of the ________ era are more widespread and less disturbed than those of any other time
Fill in the blank(s) with correct word