ACROSS
1.some light passes through the object
5.fastest medium for sound to travel
7.no light passes through the object
8.example of a conductor
10.emission of light from its source
DOWN
2.produced due to the vibration of particles in an object
3. light completely passes through the object
4.a medium where sound moves very slowly.
6.movement occurs due to the rising of hot materials paired with sinking cold materials.
9.example of an insulator