oceans recieve rainfall runoff from land surfaces. what is one way in which runoff from human activities impacts ocean systems

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.

The number at the end of an isotope’s name is the number.

What is true for a substance that releases energy