<Table> <Tr> <Th_colspan="2"> North American Plate </Th> </Tr> <Tr> <Td_colspan="2"> </Td> </Tr> <Tr> <Th> Type </Th> <Td> Major </Td> </Tr> <Tr> <Th> Approximate area </Th> <Td> 75,900,000 km (29,300,000 sq mi) </Td> </Tr> <Tr> <Th> Movement </Th> <Td> west </Td> </Tr> <Tr> <Th> Speed </Th> <Td> 15--25 mm (0.59--0.98 in) / year </Td> </Tr> <Tr> <Th> Features </Th> <Td> North America, Greenland, Bering Sea, Atlantic Ocean, Arctic Ocean </Td> </Tr> <Tr> <Td_colspan="2"> Relative to the African Plate </Td> </Tr> </Table> <Tr> <Th_colspan="2"> North American Plate </Th> </Tr> <Tr> <Th> Type </Th> <Td> Major </Td> </Tr>

What type of boundary is the north american plate