How fossil fuels form from ancient organic matter under heat and pressure over time.
Diagram showing the formation of fossil fuels, including coal, oil, and natural gas, with illustrations of plant and animal remains transforming underground over millions of years.
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Show Answer Key & Explanations
Step-by-step solution for: Fossil Fuels and Nonrenewable Energy - Worksheet | Printable ...
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Show Answer Key & Explanations
Step-by-step solution for: Fossil Fuels and Nonrenewable Energy - Worksheet | Printable ...
Let’s go step by step to solve each question on the worksheet.
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Q.1 Fill in the blanks with suitable words:
a) ______ is a fuel that produces energy in the form of heat, light, motion, or electricity.
→ The blank should be filled with “Fossil fuel” — because fossil fuels (like coal, oil, natural gas) are burned to produce energy in those forms.
b) We need ______ energy sources because these take longer time than humans.
→ This is talking about non-renewable vs renewable. Since it says “take longer time than humans,” it means they don’t renew quickly — so we need alternative or renewable energy sources. But looking at context, likely answer is “alternative” — meaning other options besides fossil fuels. However, sometimes textbooks say “clean” or “sustainable.” Let’s check common phrasing: Often it’s “We need alternative energy sources...” So I’ll go with alternative.
c) Combustion of fossil fuels releases large quantities of ______ into atmosphere.
→ Burning fossil fuels releases carbon dioxide (CO₂) and other greenhouse gases. Most basic answer expected here is carbon dioxide or greenhouse gases. Probably carbon dioxide for simplicity.
✔ Answers for Q.1:
a) Fossil fuel
b) alternative
c) carbon dioxide
---
Q.2 According to the diagram, write True or False if the statement is true.
Diagram shows formation of fossil fuels over millions of years from dead plants/animals → buried → heated/pressurized → becomes fossil fuel.
Statements:
1. Coal and oil can take less hundreds of years to form.
→ FALSE. They take *millions* of years, not “less hundreds.” Even “hundreds” is too short. So definitely False.
2. Fossil fuels were formed from coal and wood.
→ FALSE. Coal comes from ancient plant matter; oil and gas come from marine organisms (plankton, algae). Wood isn’t directly turned into oil/gas — though coal can come from woody material, but oil doesn’t. Also, saying “formed from coal” is backwards — coal IS a fossil fuel, not a source of others. So overall, this is misleading → False.
3. More million of years passed and heat cause changes in the remains of plants and animals.
→ TRUE. That’s exactly how fossil fuels form — burial + heat + pressure over millions of years.
✔ Answers for Q.2:
1. False
2. False
3. True
---
Q.3 Which of the following is a NON-fuel?
Options:
- Oil → fuel
- Natural Gas → fuel
- Petroleum → fuel
- Charcoal → fuel
Wait — all seem like fuels? But let’s think: Is there one that’s not typically classified as a primary fuel? Actually, charcoal IS a fuel — made from wood, used for cooking/heating.
But maybe trick question? All four are fuels. Unless... perhaps “Petroleum” is being considered raw material? No, petroleum is crude oil — definitely a fuel source.
Wait — maybe the question has a typo? Or perhaps in some contexts, “charcoal” is seen as processed biomass, still a fuel.
Actually — re-read: “Which of the following is a NON-fuel?” — implying one is NOT a fuel.
But all are fuels. Hmm.
Wait — perhaps “Petroleum” is meant to be “petrol”? Still fuel.
Alternatively — maybe “Charcoal” is the odd one out? No, it’s definitely a fuel.
Hold on — perhaps the intended answer is none, but since it’s multiple choice, maybe the test expects us to pick one.
Wait — let’s look again: Maybe “Petroleum” is listed separately from “Oil” — but petroleum includes oil. Confusing.
Another thought: In some curricula, “natural gas” might be considered differently? No.
Perhaps the correct answer is Charcoal — because it’s solid, derived from wood, while others are extracted from earth? But still a fuel.
I think there might be an error — but based on standard classification, ALL are fuels.
Wait — unless “Petroleum” is misinterpreted? No.
Actually — let me double-check: Is there any chance “Coal” was supposed to be an option? Not listed.
Looking back at image description — user didn’t list options clearly, but from typical worksheets, sometimes “wood” or something else is included.
But according to what you wrote: Options are Oil, Natural Gas, Petroleum, Charcoal — all fuels.
Unless... “Petroleum” is meant to be “petrolatum” or something? Unlikely.
Perhaps the question is flawed — but for school level, maybe they consider “Charcoal” as not a “fossil fuel” — but the question says “NON-fuel”, not “non-fossil fuel”.
This is tricky.
Wait — another angle: Sometimes “fuel” refers specifically to substances used in engines or power plants — charcoal is more for stoves/fireplaces — but still a fuel.
I think the safest bet — if forced to choose — perhaps Charcoal is the least “industrial” fuel, but technically incorrect.
Alternatively — maybe “Petroleum” is the answer because it’s unrefined? But no, it’s still a fuel source.
Actually — upon second thought — in some educational materials, they distinguish between “fuels” (used directly) and “raw materials” — but petroleum is refined into fuels.
I recall now — sometimes questions like this have “water” or “sunlight” as non-fuels — but not here.
Given the options, I suspect the intended answer might be Charcoal — perhaps thinking it’s not a “primary” fuel? But that’s weak.
Wait — let’s read the question again: “Which of the following is a NON-fuel?”
Perhaps “Petroleum” is the answer because it’s a mixture, not a single fuel? Still stretched.
Actually — I found a similar question online: Sometimes “coal” is listed, and “oil”, “gas”, and then “wood” — and wood is sometimes called non-fossil fuel, but still fuel.
I think there’s a mistake — but for the sake of completing, let’s assume the question meant “which is NOT a fossil fuel” — then Charcoal would be the answer, since it’s made from recent wood, not ancient remains.
Yes! That must be it. Many worksheets confuse “fossil fuel” with “fuel”. So probably, the question intends to ask which is NOT a fossil fuel.
In that case:
- Oil → fossil fuel
- Natural Gas → fossil fuel
- Petroleum → fossil fuel
- Charcoal → NOT fossil fuel (made from modern wood)
So if interpreted as “non-fossil fuel”, then Charcoal.
Since the question says “NON-fuel”, but given context, likely typo or misphrasing — and Charcoal is the only one not from ancient deposits.
I’ll go with Charcoal as the intended answer.
✔ Answer for Q.3: Charcoal
---
Q.4 Which of the following is the cleanest burning fossil fuel?
Options:
- Coal → very dirty, high CO₂, sulfur, ash
- Oil → cleaner than coal, but still polluting
- Natural Gas → burns cleaner, less CO₂ per unit energy, fewer pollutants
Natural gas is widely taught as the cleanest-burning fossil fuel.
✔ Answer for Q.4: Natural Gas
---
Now compiling all answers:
Q.1:
a) Fossil fuel
b) alternative
c) carbon dioxide
Q.2:
1. False
2. False
3. True
Q.3: Charcoal
Q.4: Natural Gas
Final Answer:
Q.1: a) Fossil fuel, b) alternative, c) carbon dioxide
Q.2: 1. False, 2. False, 3. True
Q.3: Charcoal
Q.4: Natural Gas
---
Q.1 Fill in the blanks with suitable words:
a) ______ is a fuel that produces energy in the form of heat, light, motion, or electricity.
→ The blank should be filled with “Fossil fuel” — because fossil fuels (like coal, oil, natural gas) are burned to produce energy in those forms.
b) We need ______ energy sources because these take longer time than humans.
→ This is talking about non-renewable vs renewable. Since it says “take longer time than humans,” it means they don’t renew quickly — so we need alternative or renewable energy sources. But looking at context, likely answer is “alternative” — meaning other options besides fossil fuels. However, sometimes textbooks say “clean” or “sustainable.” Let’s check common phrasing: Often it’s “We need alternative energy sources...” So I’ll go with alternative.
c) Combustion of fossil fuels releases large quantities of ______ into atmosphere.
→ Burning fossil fuels releases carbon dioxide (CO₂) and other greenhouse gases. Most basic answer expected here is carbon dioxide or greenhouse gases. Probably carbon dioxide for simplicity.
✔ Answers for Q.1:
a) Fossil fuel
b) alternative
c) carbon dioxide
---
Q.2 According to the diagram, write True or False if the statement is true.
Diagram shows formation of fossil fuels over millions of years from dead plants/animals → buried → heated/pressurized → becomes fossil fuel.
Statements:
1. Coal and oil can take less hundreds of years to form.
→ FALSE. They take *millions* of years, not “less hundreds.” Even “hundreds” is too short. So definitely False.
2. Fossil fuels were formed from coal and wood.
→ FALSE. Coal comes from ancient plant matter; oil and gas come from marine organisms (plankton, algae). Wood isn’t directly turned into oil/gas — though coal can come from woody material, but oil doesn’t. Also, saying “formed from coal” is backwards — coal IS a fossil fuel, not a source of others. So overall, this is misleading → False.
3. More million of years passed and heat cause changes in the remains of plants and animals.
→ TRUE. That’s exactly how fossil fuels form — burial + heat + pressure over millions of years.
✔ Answers for Q.2:
1. False
2. False
3. True
---
Q.3 Which of the following is a NON-fuel?
Options:
- Oil → fuel
- Natural Gas → fuel
- Petroleum → fuel
- Charcoal → fuel
Wait — all seem like fuels? But let’s think: Is there one that’s not typically classified as a primary fuel? Actually, charcoal IS a fuel — made from wood, used for cooking/heating.
But maybe trick question? All four are fuels. Unless... perhaps “Petroleum” is being considered raw material? No, petroleum is crude oil — definitely a fuel source.
Wait — maybe the question has a typo? Or perhaps in some contexts, “charcoal” is seen as processed biomass, still a fuel.
Actually — re-read: “Which of the following is a NON-fuel?” — implying one is NOT a fuel.
But all are fuels. Hmm.
Wait — perhaps “Petroleum” is meant to be “petrol”? Still fuel.
Alternatively — maybe “Charcoal” is the odd one out? No, it’s definitely a fuel.
Hold on — perhaps the intended answer is none, but since it’s multiple choice, maybe the test expects us to pick one.
Wait — let’s look again: Maybe “Petroleum” is listed separately from “Oil” — but petroleum includes oil. Confusing.
Another thought: In some curricula, “natural gas” might be considered differently? No.
Perhaps the correct answer is Charcoal — because it’s solid, derived from wood, while others are extracted from earth? But still a fuel.
I think there might be an error — but based on standard classification, ALL are fuels.
Wait — unless “Petroleum” is misinterpreted? No.
Actually — let me double-check: Is there any chance “Coal” was supposed to be an option? Not listed.
Looking back at image description — user didn’t list options clearly, but from typical worksheets, sometimes “wood” or something else is included.
But according to what you wrote: Options are Oil, Natural Gas, Petroleum, Charcoal — all fuels.
Unless... “Petroleum” is meant to be “petrolatum” or something? Unlikely.
Perhaps the question is flawed — but for school level, maybe they consider “Charcoal” as not a “fossil fuel” — but the question says “NON-fuel”, not “non-fossil fuel”.
This is tricky.
Wait — another angle: Sometimes “fuel” refers specifically to substances used in engines or power plants — charcoal is more for stoves/fireplaces — but still a fuel.
I think the safest bet — if forced to choose — perhaps Charcoal is the least “industrial” fuel, but technically incorrect.
Alternatively — maybe “Petroleum” is the answer because it’s unrefined? But no, it’s still a fuel source.
Actually — upon second thought — in some educational materials, they distinguish between “fuels” (used directly) and “raw materials” — but petroleum is refined into fuels.
I recall now — sometimes questions like this have “water” or “sunlight” as non-fuels — but not here.
Given the options, I suspect the intended answer might be Charcoal — perhaps thinking it’s not a “primary” fuel? But that’s weak.
Wait — let’s read the question again: “Which of the following is a NON-fuel?”
Perhaps “Petroleum” is the answer because it’s a mixture, not a single fuel? Still stretched.
Actually — I found a similar question online: Sometimes “coal” is listed, and “oil”, “gas”, and then “wood” — and wood is sometimes called non-fossil fuel, but still fuel.
I think there’s a mistake — but for the sake of completing, let’s assume the question meant “which is NOT a fossil fuel” — then Charcoal would be the answer, since it’s made from recent wood, not ancient remains.
Yes! That must be it. Many worksheets confuse “fossil fuel” with “fuel”. So probably, the question intends to ask which is NOT a fossil fuel.
In that case:
- Oil → fossil fuel
- Natural Gas → fossil fuel
- Petroleum → fossil fuel
- Charcoal → NOT fossil fuel (made from modern wood)
So if interpreted as “non-fossil fuel”, then Charcoal.
Since the question says “NON-fuel”, but given context, likely typo or misphrasing — and Charcoal is the only one not from ancient deposits.
I’ll go with Charcoal as the intended answer.
✔ Answer for Q.3: Charcoal
---
Q.4 Which of the following is the cleanest burning fossil fuel?
Options:
- Coal → very dirty, high CO₂, sulfur, ash
- Oil → cleaner than coal, but still polluting
- Natural Gas → burns cleaner, less CO₂ per unit energy, fewer pollutants
Natural gas is widely taught as the cleanest-burning fossil fuel.
✔ Answer for Q.4: Natural Gas
---
Now compiling all answers:
Q.1:
a) Fossil fuel
b) alternative
c) carbon dioxide
Q.2:
1. False
2. False
3. True
Q.3: Charcoal
Q.4: Natural Gas
Final Answer:
Q.1: a) Fossil fuel, b) alternative, c) carbon dioxide
Q.2: 1. False, 2. False, 3. True
Q.3: Charcoal
Q.4: Natural Gas
Parent Tip: Review the logic above to help your child master the concept of fossil fuels worksheet.
