A substance is in a state in which its particles are widely spaced and able to move freely. It changes to a state in which its particles are in contact but still able to move freely. What is this change called?

Part of molten rock at mid-ocean ridges

Schrodinger and heisenberg developed an alternate theory about atomic nature that contradicted some of bohr's model of the atom. how do changes resulting from new technology and evidence affect the reputation of the atomic theory?

Which of these would be caused by a chemical change? a) the formation of lava. b) sedimantary rock layering over time. c) metamorphic rock forming from igneous. d) metamorphic rock eroding to form sedimentary rock.