An igneous rock is found on the ground and has no identifiable crystals. what is the most likely origin of this rock? molten material that cooled slowlymolten material that cooled quicklyrock that was eroded by surrounding rocksrock that was exposed to extreme pressure

The answer would be: Molten material that cooled quickly.

Igneous rocks are formed by the cooling of molten material. So we can cross out the last two choices. The rock has no identifiable crystals so it is most likely an Extrusive igneous rock. They form on the surface where they cool quickly.

Those that form underground are called intrusive rocks. They cool slowly allowing enough time for crystal formation.

coal is not sustainable because it will one day run out.

the correct answer is option d.

an appositive is a noun, noun phrase or noun clause which follows another noun or noun phrase in order to describe it or name it another way. they are usually used between commas, brackets or dashes.

the example sentence with the correct use of commas is the following:

her uncle, the man over there in the red shirt, owns the hardware store in town.