<p>Welcome. It looks as if everyone who's coming is already here, 

                so let's start, shall we? In yesterday's class, I talked about 

                how the Earth and the Moon are thought to have formed. As I told 

                you, the best theory concerning their origins seems to be the 

                &quot;Single Source&quot; theory. This states that the Earth and 

                Moon were made out of the same ball of molten mass. I also talked 

                about how the Earth eventually cooled down and how its surface 

                features formed. And just before the end of class, we looked at 

                how all the continents were fused into one gigantic continent 

                called Pangea. Now, to continue from where we left off, we know 

                for certain that this massive continent did not last forever-just 

                look at a present-day globe. According to current theories regarding 

                continental drift, this huge landmass probably began to fracture 

                into the continents we see today about 200 million years ago. 

                This date is supported by the ages of basalt flows that have been 

                found in the middle of the Atlantic Ocean. It is likely, by the 

                way, that the Atlantic did not form immediately after Pangea's 

                breakup, but I'm getting way ahead of myself. Right now I want 

                to show you a short video about Pangea. After that, I'll talk 

                about the oceans. </p>

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