The tiny units that make up the core of an atom are called: A. (A) protons and the nucleons B. (B) Neutrons C. (C) Electrons D. (D) Quarks Correct answer is: A. (A) protons and the nucleons
Saltwater makes up about what percentage of the Earth’s surface? A. (A) 93% B. (B) 95% C. (C) 97% D. (D) 99% Correct answer is: A. (A) 93%