Heat transfer. The oven is warmer than the chocolate bar, which is solid at room temperature. The difference in temperature means that heat will transfer from the warmer oven to the chocolate bar....
chocolate has always been important, the south Americans used it for thousands of years before the europeans, who fell in a rich delectable love with it and now people still enjoy it! hope this helped
Most universities possessing a school of Culinary Arts allow students to specialize in Pastry Arts which generally includes classes on chocolate. The alternative would be to enter an apprenticeship...