(Q).
Q: A rusty bike has been left outside in damp weather too many times, so the iron in the metal parts have? Choices: - melted - eroded - decayed - rusted A:
(A).
rusted

(Q).
Q: Photographs of the heat emitted by an object are called what? Choices: - radio images - variable images - cosmic images - thermal images A:
(A).
thermal images

(Q).
Q: What tool is useful for studying the ocean floor because the environment is remote and underwater? Choices: - microscope - telescope - scale - sonar A:
(A).
sonar