If a rock had a mass of 20g explain how you would fund the density

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

An experimental procedure requires a 10 ml of acid to be dissolved

Ageochemist examines a piece of metal that he found in the soil. he performs tests to identify the metal from its density, electrical conductivity, and melting point. which statement best describes his investigation? a. he is determining physical properties that are sufficient to identify the metal.b. he is determining chemical properties that are sufficient to identify the metal.c. he is determining physical properties that are insufficient to identify the metal.d. he is determining chemical properties that are insufficient to identify the metal.