Energy comes in many forms, including electricity and magnetism. Electricity is caused by the movement of electric particles in matter. This chapter reviews electricity and magnetism. The terms conductor, insulator, electromagnet, attract, and repel are included. Physical Sciences - Sound and Light Light and sound are two forms of energy that travel in waves.
Light can travel through empty space and through some kinds of matter.
Sound can travel through matter but it cannot travel through empty space. This chapter reviews light and sound waves, including how they are sensed by people. Earth Sciences - Rocks and Soil Rocks are made of one or more kinds of minerals. The three kinds of rocks are igneous, sedimentary, and metamorphic. Soil is formed when rock is broken into small particles.