FOSSIL FUELS Flashcards
name 3 fossil fuels
coal
oil
gas
why are fossil fuels non renewable
fossil fuels are formed over millions of years so if we keep using them they will run out
explain the formation of coal
formed from the remains of ferns and trees
IF THEY DIE IN MARSHY WETLANDS THEY DO NOT DECOMPOSE DUE TO A LACK OF OXYGEN OR ACIDIC CONDITIONS which both prevent bacteria from carrying out decomposition
over time the plant remains are covered with sediment and compressed high temperatures form the coal
explain the formation of crude oil
formed from plankton (tiny plants and animals in the sea)
when they die they settle in mud on the sea bed if there is no oxygen present they don’t decompose
overtime they are compressed by sediment and heat and pressure then convert them into crude oil
explain the formation of natural gas
natural gas is mainly the hydrocarbon METHANE
FIND NATURAL GAS NEAR OIL
formed from plankton (tiny plants and animals in the sea)
when they die they settle in mud on the sea bed if there is no oxygen present they don’t decompose
overtime they are compressed by sediment and heat and pressure then convert them into crude oil
why do all fossil fuels contain carbon
the carbon was part of the carbon dioxide taken in by photosynthesis
