Which of the following statement explains how fossils can be useful? All fossils can be burned to make energy.
Fossils such petrified wood are used to generate energy.
Fossils such as amber are used to generate energy.
Fossils such as coal are used to generate 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.