What's in a smartphone? (vocabulary focus)

In this sentence: "These rare elements have a huge range of magnetic, phosphorescent, and conductive properties that make them crucial to modern technologies." --- what are two words that are closest in meaning to crucial?

• critical

• important

• key

• necessary

In this sentence: "This form of mining destroys huge swaths of natural habitats, and causes air and water pollution, threatening the health of nearby communities." -- what is the meaning of the word 'swaths'?

Which is NOT a synonym for vast (habitats)?

• huge

• immense

• massive

• miniscule

In this sentence:"That entwines our smartphones inextricably with this growing planetary conundrum." --what is the meaning of 'conundrum'?

• a problem that is difficult to solve

• a debatable issue

Definition:"a situation in which people/animals are forced to leave the place where they normally live"

Word: what is the word?

• displacement

• change

• emigration

In this sentence: "Just as the production of smartphones comes with social and environmental problems, dismantling them does too." -- what is the meaning of 'dismantling'?

In this sentence: "However, even recycling companies need our scrutiny." -- what is the meaning of scrutiny?

• careful examination/ observation

• attention

• products

• opinion