Choose the word that correctly completes the analogy limestone rock calcite

limestone rock calcite mineral

The missing word is: Mineral.

That is because limestone is a sedimentary rock and the calcite is a carbonate mineral, by logical deduction, the analogy is pretty much describing what the first and  third words are.

So, in the end, a limestone is a rock and calcite is a mineral.

mineral

Explanation:

the answer is mineral... just trust me

the rigid outer part of the earth, consisting of the crust and upper mantle is the lithosphere.     answer   crust and outer part of the mantle.

the answer is:

when will (v) the books (n) be (v) due?

nouns refer to people (other than pronouns), places and things, whereas verbs describe actions and are usually part of the predicate of a sentence. finally, pronouns can work as nouns and identify the participants in speech.

in the example sentence, "will" is a verb part or auxiliary verb, "be" is an infinitive verb and "books" is a plural noun.