Which phenomena help form Earth's magnetic field? Check all that apply. weather on Earth's surface
rotation of Earth on its axis
metal liquifying in the inner core
revolutions of Earth around the Sun
rock solidifying in the outer mantle
motion of metal in Earth's outer core

Answertropical depression;

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