Convert 75 miles/hour to km/s.

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.

c- cold periods in earth's history during which glaciers covered much of the surface.

explanation:

it's filtration, but this is an assumption so my apologies if i got this