Los reactivos y los productos de las
reacciones quimicas se representan por
medio de ecuaciones. ¿Cual de las
siguientes ecuaciones quimicas muestra
CORRECTAMENTE la conservación de
la masa?

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

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?

What do electromagnetic waves carry? how are they produced through which media can they move? where do they transfer energy? what do they not transfer? what do mechanical waves carry? how are they produced? through which media can they move? where do they transfer energy? what do they not transfer?