2.2 Make precise calculations and check the validity of the results in the context of the problem. Properties of materials can be observed, measured and predicted. Students know water can be a liquid or a solid and can be made to change back and forth from one form to the other. Different types of plants and animals inhabit the earth. Students know stories sometimes give plants and animals attributes they do not really have.
Earth is composed of land, air, and water.
Students know changes in weather occur from day to day and across seasons, affecting Earth and its inhabitants. Students know how to identify resources from Earth that are used in everyday life and understand that many resources can be conserved. Scientific progress is made by asking meaningful questions and conducting careful investigations. As a basis for understanding this concept and addressing the content in the other three strands, students should develop their own questions and perform investigations. Observe common objects by using the five senses.