(Question)
Q: Vibrating electric and magnetic fields make up what kinds of waves? Choices: - seismic - eletrical - mechanical - electromagnetic A:
(Answer)
electromagnetic

(Question)
Q: What force includes forces of attraction and repulsion? Choices: - centripetal force - gravitational force - molecular force - magnetic force A:
(Answer)
magnetic force

(Question)
Q: What is a process where some substances called reactants change chemically into different substances called products? Choices: - crystals reaction - carbon reaction - non-chemical reaction - chemical reaction A:
(Answer)
chemical reaction