What is the energy of an object because of its potential and kinetic energies?

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

Zoe is investigating the composition of substance a, an unknown substance. using chemical processes, she analyzes substance a and determines it is composed of sodium, oxygen, and hydrogen atoms in a ratio of 1 : 1 : 1. what is substance a? a. a compound b. an element c. a heterogeneous mixture d. a homogeneous mixture

How much energy is made when a pice of wood burns. how do you know