12. What is the mass number of an atom that has 4 protons, 4 electrons, and 5 neutrons?

Which sentence best describes the formation of igneous rock? a- lava on the surface dries up and makes arock b_melted rocks cools and forms crystals c_rocks under tremendous heat and pressure d_magma is melted rock underground

2. how is heavy water different from normal water

How does the principle of electromagnetism explain the interaction between earth’s magnetic field and the solar wind?