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Cigarettes
The most common cause of death in a tornado is being hit by debris.
plankton?
Plastic.
Plastic. Plastic will usually float. There are vast areas in the "doldrums" of the oceans where millions of tons of plastic bottles, fishing nets and other plastic garbage are floating. These areas of ocean are called 'gyres' where the currents move around in one gigantic but slow-moving whirlpool. The largest is called the Great Pacific Garbage Patch, and is found in the North Pacific Gyre. The plastic gradually breaks down into tiny pellets, which are swallowed by whales and other marine life as they resemble plankton. See the link below.
In sea/oceans waters and in salt mines.
sodium chloride
Water (H2O) and salt (NaCl).
In bodies of water, like lakes, streams, ponds, rivers, and oceans.
Granite for the continents; Basalt for the oceans.
This question depends on what importance is being assigned. The most common dissolved ions (elemental atoms do not dissolve) are sodium and chloride, but they are many other important elements found in sea water.
Oceans are formed from water; the major contaminant is sodium chloride.