Which theory changed because of the evidence known as seafloor spreading? a. continental drift theory b. mid-atlantic ridge theory c. pangea theory d. theory of plate tectonics

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.