Why did it take so much time and effort to construct the panama canal?

The Panama Canal took 10+ years to construct because construction workers only worked on it once every two weeks. This was because they were faced with difficult weather trying to build it. Difficulties such as land sliding, rain, costs, inadequate machinery, and the threat of yellow fever and malaria.

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

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