2. According to the theory of continental drift, why do the coastlines of Africa and South America appear to fit together so well? O A Africa and South America used to be joined together, but split apart long ago.
O B. Africa and South America are drifting towards each other and will soon fit together perfectly
O c Ocean currents on either side of the Atlantic have eroded the coastlines into the same shape.
O D. The theory does not explain why the coastlines seem to match,

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chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.

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