Solve these clues to fill the grid.
- A mass of small bubbles formed in or on a liquid
- 2 Across
- A signal transmitted along a narrow path
- 3 Across
- A sweet drink containing carbonated water and flavoring
- 4 Across
- A circular segment of a curve
- 8 Across
- A line on a graph representing data
- 10 Across
- State of matter that flows like water
- 13 Across
- The act of conducting a controlled test or investigation
- 14 Across
- What lets us see; the opposite of dark
- 15 Across
- An abundant nonmetallic tetravalent element occurring in three allotropic forms: amorphous ___
- 1 Down
- Any of various water-soluble compounds having a sour taste and capable of turning litmus red
- 5 Down
- To manifest or bring back
- 6 Down
- The science of matter
- 7 Down
- Pouring out fumes or lava
- 9 Down
- The simplest structural unit of an element or compound
- 11 Down
- The act of ___ together
- 12 Down
- State of matter that fills any space, like air
- 16 Down