(Question)
Q: What model of the atom features an electron orbiting a nucleus, forming a closed-current loop and producing a magnetic field with a north pole and a south pole?. Choices: - hydrogen model - solar model - gravitational model - planetary model A:
(Answer)
planetary model

(Question)
Q: What do we call the full range of electromagnetic waves? Choices: - electromagnetic scale - molecular spectrum - mechanical spectrum - electromagnetic spectrum A:
(Answer)
electromagnetic spectrum

(Question)
Q: What do some animals use for shelter? Choices: - invisible materials - indestructible materials - living materials - nonliving materials A:
(Answer)
nonliving materials