Rick J. "What can you tell me about rocks, I have a report on them to do?"

Rocks, eh.  Well most rocks are outside, like Mt. Augustus in Australia, which is the worlds biggest rock.  Rocks are also hard, rock hard to be more precise.  Different rocks have different hardnesses however, this is measured on the Mohr's scale, which ranges from 1 to 10.

1.  Talc (Baby Powder) -- soft as a baby's bottom
2.  Gypsum -- Rocks with the mental capacity of those who believe Gypsies and astrology
3.  Calcite -- Rocks found in heads in California especially Hollywood
4.  Fluorite -- Rocks found in heads of Florida voters
5.  Apatite -- Truck stop biscuits
6.  Moonstone -- Green Cheese
7.  Quartz -- Used for most watches, not hard to get at all
8.  Topaz -- this is a tough one; leave a suggestion in the comments
9.  Corundum -- between a rock and a hard place
10.  Diamond -- A girls best friend (not the dumpy one, the other one)

There are also three basic types of rocks classified by how they are made.  Sedentary, metaphoric, ignominious.

Sedentary rocks are common, they just sit there and do nothing.
Metaphoric rocks are like killing two birds with one stone.
Ignominious rocks are actually used to kill two birds.

You didn't give a page length for your report, but I help this helps.  Additional hints on writing good reports can be found here --> Click Here.