How are the elements divided in Modern Periodic table in accordance with their metals and nonmetals

Which statement is a reason to support population regulation? a) it is unethical for us to control birth control rates b) humans have the freedom to produce as many children as desired c) the gap between the rich and poor has been narrowing since 1960 d) billions more people on the earth will intensify many environmental and social problems

In which layer of earth do most earthauakes occur a_ inner core b_outer core c_mantle d_crust

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