Drag the tiles to the correct boxes to complete the pairs. Match the causes with their effects. Cause: Convection currents cycle through magma. Cause: Unstable isotopes inside Earth release energy. Cause: Iron in Earth's outer core swirls due to convection currents.

covalent bonding is a form of chemical bonding between two non metallic atoms which is characterized by the sharing of pairs of electrons between atoms and other covalent bonds.

some scientists like gregory adcock agree with thorne's theory of regional continuity.

others, like chris stringer and ian tattersall, believe thorne's results may be contaminated or misinterpreted.