Review the information on the chart and look for patterns of where the cities are located

Mexico City: Gulf of California (Mar de Cortes), Gulf of Mexico, San Juan River and lake Chapala

New York: Arctic Ocean, Lake Ontario, lake Erie, Niagara River, Lake Champlain, St, Lawrence River, Genessee River

Paris: Seine, Canal Saint-Martin, Lac des Minimes, Lac Daumesnil, Bassin de la Villette

Tokyo: Meguro River, Sumida River, Kyunaka River, Lake Okutama, Tokyo Bay, Arakawa River, Tama River

So  if  the sum of the enthalpies of the reactants is greater than the products, the  reaction  will be  exothermic.  if  the products side has a larger enthalpy, the  reaction  is  endothermic. you may wonder why  endothermic reactions, which soak up energy or enthalpy from the environment, even happen