<P> Mountain ranges outside these two systems include the Arctic Cordillera , the Urals , the Appalachians , the Scandinavian Mountains , the Altai Mountains and the Hijaz Mountains . If the definition of a mountain range is stretched to include underwater mountains , then the Ocean Ridges form the longest continuous mountain system on Earth , with a length of 65,000 kilometres ( 40,400 mi ) . </P>
<P> Mountain ranges outside these two systems include the Arctic Cordillera , the Urals , the Appalachians , the Scandinavian Mountains , the Altai Mountains and the Hijaz Mountains . If the definition of a mountain range is stretched to include underwater mountains , then the Ocean Ridges form the longest continuous mountain system on Earth , with a length of 65,000 kilometres ( 40,400 mi ) . </P>
what is a continuous series of underwater mountains called
what is a continuous series of underwater mountains called
Ocean Ridges
Ocean Ridges