Changing the rate of vibration can vary the pitch. Light travels in a straight line until it strikes an object. Light can be reflected, refracted or absorbed Heat can be produced in many ways, such as burning, rubbing and mixing substances. Heat can move from one object to another by conduction. Electricity in circuits can produce light, heat, sound, and magnetic effects.
Magnets attract and repel each other and certain kinds of other materials.
Magnets Changes Weather 3. The sun provides the light and heat necessary to maintain the temperature of the earth. The surface of the earth changes through erosion, landslides, volcanic eruptions and earthquakes. Weather changes from day to day and over the seasons Objects in the sky have patterns of movement. Weather Changes 4.