Identify the true statement.
a. strip mining can be done economically down to a depth of about 1 km.
b. anthracite coal develops at depth along mountain belt borders, where temperatures reach 600°c.
c. underground coal mining is dangerous because of possible tunnel collapse and possible methane gas explosions.
d. coal began to form on the earth soon afterlife evolved in the precambrian.

Option (C)

Explanation:

Coal is a sedimentary rock that forms due to the accumulation of dead matters of plants, trees, and converting it into coal over millions of years.

This coal is extracted from the earth in two ways-

Thus, the correct answer is option (C)- which is true.

the part i "agree with' is " it should not matter what color their skin is or what their cultural beliefs are." but for the main part i agree with it all or if cause now and days there are some people don't get the job cause there skin color and there beliefs and some times they don't even get the same repest as white people. we are all equal.