Asap help! science research

Which statement describes john tuzo wilson’s contribution to the theory of plate tectonics? he proposed that plates carry parts of the seafloor. he theorized that pieces of earth move for a limited time. he suggested that the asthenosphere is broken into segments. he observed seafloor cracks similar to existing cracks in the continents.

¿cual es mas alta en baja california,la migracion o la inmigracion?

What is the approximate chemical composition of the solar nebula?