The _____ is the depth where the rate at which calcareous sediments are supplied to the seabed equals the rate at which those sediments dissolve.

Terrigenous sediments come from _____.

How is the seafloor at a mid-ocean ridge (spreading center) different from seafloor at the edges of the ocean basin?

Very few areas along the ocean floor are altogether free of overlying sediment. What could be the reason sediment does not collect in these areas?

Let T be the set {3, 4, 5, 6, 7, 8, 9, 10} and suppose five integers are chosen from T . Must two of these integers have the property that the difference of the larger minus the smaller equals 2?

The asthenosphere is the _____.

How do acids and bases react to a hydrogen ion in solution? 

What is another name for the equatorial low that sailors call the doldrums? 

The circular current of air in a room with a hot radiator opposite a cold window, known as a(n) _____current, is caused by the difference in temperature between the opposite ends of the room. 

What is the term used to describe the total quantity (or concentration) of dissolved inorganic solids in water?