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Lesson 2.2 Why a Pennsylvania Town has been Burning for 60 Years

Last updated about 1 year ago

21 Nsɛmmisa

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21.

In the past 50 years, California has switch from using the combustion of coal to the combustion of methane to generate electricity. What are the advantages of using methane as a fuel rather than coal. For full credit, you must use evidence from the article to support you answer.

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1.

What caused the eerie silence in the town of Centralia?

A government mandate

A natural disaster

Abandoned coal mines

An underground fire

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3.

Why is a fire inside a mine so dangerous to the people who live near by?

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7.

Coal is the only fuel that does not have water (H₂O) as a product of combustion. Why do you think that is true?

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2.

What is subsidence in the context of the article?

Collapse of ground due to weakened rock

The spread of the fire to neighboring towns

population decline

economic decline

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4.

The carbon content is the percentage of the mass of carbon in the sample of coal. Which type of coal has the most carbon in it?

Lignite

Clean

Bituminous

Anthracite

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6.

Which fuel has the highest heat of combustion?

coal

octane (gasoline)

wood

methane (natural gas)

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10.

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11.

An example of activation energy would be

the energy released from a hot pack

the energy needed to light a match

the energy absorbed when ice melts

the energy released when hot water cools

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13.

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14.

According to the tetrahedron of fire, an effective way to put out the fire might be to......

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16.

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20.

How long can an underground coal fire burn?

6000- 250 years

more than 6000 years

5 - 70 years

250- 70 years