Energy
	Forms, Nature, Properties: -Light travels in straight lines until it is reflected, refracted or absorbed. (K-4) -Heat can produced in many ways. (K-4) -Heat can move objects by conduction (K-4) -Electricity in circuits can produce light, heat, sound and magnetic effects (K-4) -Magnets attract and repel each other and other materials. (K-4) -Energy is a property of many substances. (5-8) -Energy is transferred in many ways (5-8) -Heat moves from warmer to cooler (5-8) -In most chemical and nuclear reactions, energy is transferred (5-8) -The sun is a major source of energy for Earth. (5-8) -Waves can transfer energy such as sound, seismic and light. (9-12) -Electromagnetic waves result when a charged object is accelerated. Examples are radio waves, microwaves, infrared, ultraviolet, visible (9-12) -Each kind of atom can gain or lose energy only in particular discrete amounts. (9-12) -Wavelengths of emitted radiation can be used to identify the substance. (9-12)