Can you help me please ​

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

Which statement would indicate the presence of an acid

In order for a high temperature boiler or steam engine to produce superheated water, or steam: the heat source must be greater than 100°c the water must be permitted to evaporate quickly the system must be sealed and become pressurized above atmospheric pressure the vapor pressure must be kept below 760 mm(hg)