Caution: If making chocolate cake, brownies, or any other intensely chocolate-flavored baked good, do not replace all of the chocolate with cocoa powder; it will have a drastic effect on the texture. To Replace: 1 ounce unsweetened chocolate. 3 tablespoons cocoa powder + 1 tablespoon vegetable oil.
Change plates, also known as fractional or micro plates are olympic weight plates made in smaller sizes ranging from 0.25kg through to 5kg. They offer tremendous flexibility for all lifters at various strength levels.
1 Useful generalization - when plates move, areas of continental crust do not change area as much; however, areas of oceanic crust can change area signficantly.  Look at the North American plate as the Atlantic opens, grows wider and gains area. The area of gain is in the area of oceanic crust, not the continent.