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Crossword clues

Solve these clues to fill the grid.

The absence of matter
2 Across
Energy that makes things warm
3 Across
A tiny piece of anything (plural)
5 Across
The star our planet orbits
7 Across
How tightly packed the matter in something is
9 Across
Energy that travels in waves or particles
12 Across
The vast area beyond Earth's atmosphere
13 Across
Rolling swells on the sea
14 Across
The transmission of heat or electricity or sound
15 Across
An elementary particle with negative charge (plural)
16 Across
A flow of electricity through a conductor (plural)
1 Down
A substance that is ___ at room temperature and pressure (plural)
4 Down
The transfer of heat through a fluid caused by molecular motion
6 Down
Any of several chemical elements that are usually shiny solids that conduct heat or electricity (plural)
8 Down
People who are ___
10 Down
A material such as glass or porcelain with negligible electrical or thermal conductivity (plural)
11 Down

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