Planetary Objects
	Composition and Structure: -Planetary materials are solid rock, soil and ice (K-4) -Solid materials have different physical and chemical properties (K-4) -Soils have color and texture (K-4) -Planetary objects have layers (5-8) -Rock layers may form plates that can move (5-8) -Landforms result from constructive and destructive forces (5-8) -Solid material is changed and recycled by compacting, heating and recrystalizing (5-8) -Planetary objects have internal and external sources of energy (9-12) -Transfer of heat causes plates to move (9-12)