4.1 Classifying Plants and Animals (Life Science) 4.2 Energy From Plants (Life Science) 4.3 Ecosystems (Life Science) 4.4 Changes in Ecosystems (Life Science) 4.5 Systems of the Human Body (Life Science) 4.6 Water Cycle and Weather (Earth Science) 4.7 Hurricanes and Tornados (Earth Science) 4.8 Minerals and Rocks (Earth Science) 4.9 Changes To Earths Surface (Earth Science) 4.10 Using Natural Resources (Earth Science) 4.11 Properties of Matter (Physical Science) 4.12 Heat (Physical Science) 4.13 Electricity and Magnetism (Physical Science) 4.14 Sound and Light (Physical Science) 4.15 Objects in Motion (Physical Science) 4.16 Simple Machines (Physical Science) 4.17 Earth's Cycles (Space and Technology) 4.18 Inner and Outer Planets (Space and Technology) 4.19 Effects of Technology (Space and Technology)