The U.S.Environmental Protection Agency has agreed to allow BP, the British oil company responsible for the spill and its cleanup, to dispose of solid oil waste in approved landfills along the U.S.Gulf Coast.

VOA: standard.2010.08.05

The oil dried,leaving behind a partly solid substance called asphalt.

VOA: special.2010.04.07

Cuticle wax is a solid oil, and is just as susceptible to the diatoms' charms as any other oily substance.

ECONOMIST: Pest control

Today, the world has a solid inventory of oil on hand.

CENTERFORSECURITYPOLICY: Center for Security Policy | U.S., Allies Should Plan To Avoid Oil Price Run Up Fed By Speculation

Moreover, the sorts of fields that Western oil firms are starting to develop, in very deep water, or of nearly solid, tar-like oil, are ever more technically challenging.

ECONOMIST: Face value