The reasons for the demise of the Mycenaean civilization, which occurred in stages from c. 1230 BCE to c. 1100 BCE, are debated. We do know that several sites were destroyed between 1250 and 1200 BCE, ushering in the so-called Post-Palatial period when the centralised system of palace control declined.
During the early to middle years of the nineteenth century between<span> 1836-1860</span>
C President Theodore Teddy Roosevelt
There are many of them but the most common are:
1.) Photosynthesis
2.) Solar Energy
3.)Thermochemical Reactions
