How does sea floor spreading support the theory of continentals?

When the sea floor splits or the tectonic plates moves apart, magma is exposed and cools to make a new sea floor.

Wheres the answers to the question

The us is first  the  u.s. economy  remains the  largest in the world  in terms of nominal  gdp. however, the  u.s. economy  loses its spot as the number one  economy  to china when  measured  in terms of  gdp  based on ppp. in these terms, china's  gdp  is $23.19 trillion exceeds the  u.s. gdp  of $19.42 trillion