fossil fuels Flashcards
how long are fossil fuels formed over?
millions of years
fossil fuels are non-renewable, what is meant by this?
if they keep getting used, eventually they will run out
coal is formed from the remains of ____ and ____?
coal is formed from the remains of therns and trees
when the remains of therns and trees die in marshy wetlands, why do they not decompose?
because there is a lack of oxygen or acidic conditions
what do a lack of oxygen or acidic conditions prevent bacteria from doing?
carrying out decomposition
over time, remains of plants are covered with _____ and _____?
overtime, remains of plants are covered with sediments and compressed
high temperature and pressure creates ____?
high temperature and pressure creates coal
what animal/tiny plants is crude oil formed from?
plankton
when plankton die, where do they settle?
when plankton die, they settle in mud on the sea bed
similar to coal, if ____ is not present, plankton do not decompose?
similar to coal, if oxygen is not present plankton do not decompose
overtime, plankton is compressed by ______?
overtime, plankton is compressed by sediment
____ and ___ convert plankton into crude oil?
heat and pressure convert plankton into crude oil
what is natural gas mainly made of?
hydrocarbon methane
where do we often find natural gas?
near deposits of oil
why do we find natural gas near deposits of oil?
because natural gas is formed from plankton, similarly to oil
