(Definition of âallotâ from the Cambridge Advanced Learnerâs Dictionary & Thesaurus Â© Cambridge University Press) allot in American English See all translations
Fossil fuel s-fuels derived from the remains of dead organisms. Examples include coal, oil, oil shales, tar sands, natural gas, and peat. Hydrocarbon s are molecules that incorporate both carbon and hydrogen. When hydrocarbon molecules are exposed to heat, the bonds linking the carbon and hydrogen atoms break.
The majority of fossils are found in clastic sedimentary rocks such as shale and sandstone. This type of rock is formed from mechanical weathering debris. Fossils are also found in limestone. Besides sedimentary rocks, fossils are also preserved in amber, which is formed from tree sap or resin. Usually, insects are the unfortunate organisms that get trapped and preserved in amber. Tar pits are another preservation medium for some animals.