Light travels until it strikes an object. Heat can be produced in many ways. Heat can move from one object to another, from the sun to the earth and to people. The sun provides the light and heat necessary to maintain the temperature of the earth. The surface of the earth changes.
Weather changes from day to day and over the seasons Objects in the sky have patterns of movement.
The characteristics of organisms, Lifecycles of organisms, Organisms and environments. Each plant or animals has different structures that serve different functions in growth. Humans and other organisms have senses that help them. Plants and animals have life cycles that include being born, developing into adults, and eventually dying. Plants and animals closely resemble their parents.