What physical factors and positions or movements of the earth cause different amounts of energy to strike the surface of the earth? ( )

1. The position of the earth (The Earth is tilted about 23 degrees so as it goes around the sun light strikes the planet's northern hemisphere more directly in summer than in winter.)

2. Gravity

3. Friction

4. Radiation

Just some thoughts

- "the choice that is not an indicator of a chemical change is "state of matter changes". more common than not, chemical reactions produce energy in the form of light or heat. along with energy, they also produce a new substance called the product that could be in any state of matter (solid, gas, or liquid)."