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What are tar sands?

Answer 1

A vast resource (175 billion barrels) of lower quality oil, more correctly called bitumen, found mostly in Alberta, Canada.

Since a large portion of the lighter hydrocarbons in this oil have been bled off over time, it must be upgraded by adding hydrogen during extraction, which raises production costs and produces more greenhouse emissions.

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Answer 2

Xavier Atkins

Tar sands, also known as oil sands, are a type of unconventional petroleum deposit containing a mixture of sand, clay, water, and a dense form of petroleum known as bitumen.

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Answer from HIX Tutor

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.