useless trivia: What Word Means: A Native Or Resident Of Iowa?

Questions

Contamination of air, water, or soil by materials that interfere with human health, the quality of life, or the natural functioning of ecosystems?

Conversion of the vibrations of sound (for example, music) into a permanent record, & its later playback in its original form (sound)?

Could a lethal drug kill you?

Countries of the world, southern shore of Arabian peninsula, Sana'a is the capital?

33 atolls in mid-Pacific Ocean, Tarawa is the capital?