3. Which was not listed as a hazard of mining.
A. Chemical leaks and spills
B. Heavy machinery accidents
C. Electrocution
D. Black lung

[ answer ]

foliated

[ explanation ]

foliation forms in a rock when pressure squeezes the rock together. the rock then has a design of many different color little lines. there are three types of foliated rock. the types are slate, schist, and gneiss. each type of foliated rock is different based on grain size and foliation characteristics. the lines appear when the rock has been under pressure.

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your answer is "the 1950's"

the sphincter muscles at the end of the digestive tract is the anus.