SME
Grade 12 Science · Problem type
How coal forms
Use this for “Describe how fossil fuels such as coal form.”
Put in order
Put the steps in the formation of coal in order.
1
?
2
?
3
?
4
?
5
?
Assumptions
•
Oil and gas form in a similar way, from tiny sea organisms buried in mud.
•
The whole change takes millions of years, so fossil fuels are nonrenewable.
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Where electricity comes from
Use this for “What share of US electricity comes from fossil fuels, and what share is renewable?”
How long a reserve lasts
Use this for “400 billion barrels of oil are used at 12.5 billion a year. How many years will they last?”
How long a reserve lasts when use grows
Use this for “600 billion barrels are used at 15 billion a year, and use grows steadily by 2% a year. How many years will they last?”