Lesson 3: Physical Properties of Matter. What is a Property? A property is a characteristic that describes an object or a substance.
Lesson 5: Changes in Matter. The Law of Conservation of Matter and Energy tells us that matter and energy cannot be created or destroyed. But matter can.
Lesson 6: Earth’s Water Cycle. What is the Water Cycle? The water cycle is the continual movement of Earth’s water between the land, ocean, and air.
