Why is oil a nonrenewable energy resource?
The natural forming of oil is slower than the rate of consumption
Oil is a carbon-based fuel that forms over thousands of years when plant and animal remains are exposed to extreme conditions, such as high pressure (under a layer of mud on the ocean floor). For this reason, the oil that we use today took millennia to form. At present, we rely more and more on oil to produce gasoline and other products, and most oil-based products (like petrol) are burned during use, releasing carbon gasses into the atmosphere that we are unable to recycle to produce more oil.
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Oil is nonrenewable because it takes millions of years to form from organic materials under high pressure and heat. The rate of consumption exceeds the natural replenishment process.
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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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