Sleep. Melatonin is for sleep
<span>Geography The land between the Tigris and Euphrates rivers was. a good region for agriculture. Geography The environment of Mesopotamia presented several. challenges to the people who lived there. Geography Mesopotamians changed their environment to improve life.
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<span>In the mantle, heat is transferred as soft rock flows slowly in cycles known as convection currents. convection currents are the currents that are caused due to the process of convection. It is actually one of the three main process of heat transfer. The other two process of heat transfer are conduction and radiation. </span>
