which system of astronomical coordinates does not have its point of origin at the vernal equinox?

celestial
ecliptic
equatorial
galactic

wavelength divides in half and speed stays the same.

igneous rocks also form where plates converge. the subducting plate melts as it sinks into the crust of the earth, and the melt rises into the overriding plate forming volcanoes. metamorphic rocks are formed mainly in the lithosphere, wherever there is high pressure and high temperature. -woods

i think it would be 5