CFCs are hydrocarbons in which some or all of the hydrogen atoms have been replaced by fluorine atoms. They are often used as refrigerants, solvents and until recently as propellants in aerosol cans. When released, they rise high into the Earth’s atmosphere where they interact with the Sun’s ultraviolet rays. Read the rest of this entry »
How do chlorofluorocarbons (CFCs) affect the ozone layer?
March 27th, 2008 Admin Posted in Earth Science, Ecology 1 Comment »
How acidic is acid rain?
March 22nd, 2008 Admin Posted in Ecology No Comments »
Acidity (or alkalinity) is measured on a pH scale which is an abbreviation for its “potential for Hydrogen.” The scale measures a substance’s acidity from zero to 14. Zero would be extremely acidic and 14 is not acidic at all (very basic). Of course, 7 is right in the middle of the scale and is neutral. Read the rest of this entry »