The sun is the ultimate source of energy for life systems while heat convection currents deep within the earth are an energy source for shaping the earth&#146;s surface.
(The sun; is; the ultimate source of energy for life systems) (heat convection currents deep within the earth; are; an energy source for shaping the earth&#146)
The sun heat convection currents deep within the earth
is are
the ultimate source of energy for life systems
an energy source for shaping the earth&#146