Question 4Multiple ChoiceWhat is the most abundant gas in Earth's atmosphere?OxygenCarbon DioxideNitrogenHydrogen
Question 6Multiple ChoiceWhat force keeps planets in orbit around the sun?Magnetic ForceNuclear ForceGravitational ForceElectrostatic Force
Question 7Multiple ChoiceWhich organ is primarily responsible for pumping blood throughout the body?LungsBrainKidneysHeart
Question 9Multiple ChoiceWhat is the speed of light in a vacuum?300,000 km/s150,000 km/s450,000 km/s600,000 km/s
Question 10Multiple ChoiceWhich scientist proposed the theory of relativity?Isaac NewtonAlbert EinsteinGalileo GalileiMarie Curie