1. speed or rate of motion.   Hint First letter clue   2. thick-skinned animal (or person).   First letter clue   3. animal that nurses its young in a pouch.   First letter clue   4. passing from one state to another.   First letter clue   5. small outlet or inlet.   First letter clue   6. substance that helps propel or push forward.   First letter clue   7. green coating on old bronze.   First letter clue