2. what industries in chechnya are key to the russian federation?
oil
minerals
timber
all of the above

The best and most correct answer among the choices provided by your question is the third choice or letter C.

Timber is one of the primary industries in Chenchnya which became a key to the Russian Federation.

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Your answer is d. silli hope this ! : ) i left an explanation down below if you need it: a sill forms when hot magma squeezes between layers of rock to form a hardened sheet of rock. a sill is basically a tabular sheet intrusion between old layers of sedimentary rock, volcanic beds, or in the direction of foliation inherent in metamorphic rock. the word sill means a concordant intrusive sheet.