I need to write a 100-150 word paper on how metamorphic rocks are formed. I know the basics (heat and pressure), but I'm having trouble condensing the information and deciding what's important to go in the paper.

Write your paper. Let it sit a day or so -- then go back and edit, edit, edit. I'm sure you can figure out what's essential and what's not.

Condensing material can be hard -- as I learned in high school journalism. We often had to write a paragraph about another student -- in only 100 words.