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10 May, 05:51

Identify the true statement. Choose one:

A. Underground coal mining is dangerous because of possible tunnel collapse and possible methane gas explosions.

B. Anthracite coal develops at depth along mountain belt borders, where temperatures reach 600°C.

C. Strip mining can be done economically down to a depth of about 1 km.

D. Coal began to form on the Earth soon after life evolved in the Precambrian.

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  1. 10 May, 06:14
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    A. Underground coal mining is dangerous because of possible tunnel collapse and possible methane gas explosions.

    Explanation:

    Dangers of underground coal mining include asphyxiation, methane gas poisoning, tunnel collapse and explosions of methane gas, a highly flammable gas. Methane explosions occur since this gas is a byproduct of coal. This explosion can cause tunnel collapse.
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