Which of the following are true statements? The sun transfers energy to Earth by radiation.
Energy is all around us including the human body.
Conduction heats through direct contact.
Heat is not a form of energy.

Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.