Logan has been studying rocks at school. How could he learn more about the different types of rocks that come from volcanoes? A. watch videos about volcanic rocks
B. read comics about imaginary rocks
C. explain to his sister how volcanoes form
D. collect rocks at the shore

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.