1. place in surrounding mass.   Hint First letter clue   2. build or invent.   First letter clue   3. dry up by removing moisture.   First letter clue   4. produce or create.   First letter clue   5. make impure by mixing with baser ingredients.   First letter clue   6. seal seams to make watertight.   First letter clue   7. encode a message.   First letter clue