Ocean- #16, #24, #30, #62

Methane- #16

Methane is a simple alkane. 40% of the world's methane can be found in the ocean.

Source:

http://www.wisegeek.com/what-is-methane.htm

Sand- #24

Sand is the chemical silicon dioxide, SiO2, which is bonded covalently. Sand does not dissolve in water, conduct electricity, or melt below 1500 degrees celsius.

Source:

http://www.sciencelab.com/msds.php?msdsId=9924924

Methane- #30

Methane, CH4, is covalently bonded. The is a carbon in the center with an H bonded to four sides.

Source:

http://www.wisegeek.com/what-is-methane.htm

Hydrocarbons- #62

Methane, found in the ocean, is a common Hydrocarbon. Hydrocarbons are made of non-polar molecules.

Source:

http://hyperphysics.phy-astr.gsu.edu/hbase/organic/hydrocarbon.html