Gold jewellery it is non renewable or renewable​

What is the meaning of "full tide" as it is used in this sentence? before i could explain to her the differences of language in this world, she was embarked on the full tide of another subject. a long and involved argument an inaccurate representation a detailed and lively discussion an uncontrollable flood

What is the italicized part in the sentence , all of the operators are efficient.

What other theme is addressed in the passage?