Final answer:
A controversy involves debate and social situations. Thinking about expediency means considering what is necessary. The hydrosphere includes water in various forms.
Step-by-step explanation:
6. A controversy involves debate and sometimes social situations. It is a disagreement or argument about a particular issue or topic that can arise in various contexts.
7. To think about expediency is to think about what is necessary or required in a given situation, considering practicality and efficiency.
8. Something extraneous is unimportant or irrelevant to a particular subject or matter. It is not essential or necessary.
9. An expatriate no longer lives in his or her native country. They have relocated or moved to a different country to live and work.
10. The hydrosphere includes water in various forms, such as rivers, lakes, oceans and other bodies of water. It encompasses the water on Earth and plays a crucial role in the planet's ecosystems.
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