Fill in the blanks to complete the sentences.
Harry Hess proposed the idea of to explain the formation of new rock at underwater ridges.
Intense heat at Earth's core creates in the mantle, which in turn leads to movement in the .
Plate tectonics drives the transformation of into metamorphic and igneous rock during the .
Harry Hess proposed the idea of seafloor spreading to explain the formation of new rock at underwater ridges.
Intense heat at Earth's core creates convection currents in the mantle, which in turn leads to movement in the tectonic plates.
Plate tectonics drives the transformation of sedimentary rock into metamorphic and igneous rock during the rock cycle.