Answer: A. Sun, Moon, Earth
Number 3 i think is <span>d.heat moves from an object of higher temperature to an object of lower temperature</span>
+2
Barium has a positive charge of 2
The answer is (4). You may recall the term "radiometric dating," which refers to the dating of old artifacts by measuring proportions of certain radioactive isotopes they contain and making calculations based on their estimated half-lives. Geological formations are dated in this way.
