Puzzle 8: Matter, Light & Shadows

2. An opaque object forms a dark region on the wall because it will completely ___.
4. A marble retains its form when moved from a box to a cup because it has a ___.
6. Why can more air be pumped into a basketball? Because gases can be forced to ___.
9. Air inside a balloon can expand to fill a larger room because gases have an ___.
12. The amount of space that an object occupies.
16. We can see non-luminous objects because they ___ light from a lamp into our eyes.
17. This type of material allows most light to pass through it clearly.
18. To make a shadow on the screen larger, a student should decrease the object's ___.
21. A stone dropped in a beaker pushes water up, showing a method of measuring volume by ___.
22. Moving an object closer to a torch will cause a dramatic change in the ___.
24. This type of material does not allow any light to pass through it.
26. This type of material allows only some light to pass through it.

1. Clear glass allows a shadow to disappear because it lets all ___.
3. An object that emits or produces its own light, such as the Sun or a lit torch.
5. This state of matter has a definite volume but no definite shape.
7. Syringes filled with water cannot be pushed in because liquids have a ___.
8. A dark area formed on a screen when light is completely or partially blocked by an object.
10. Why does water level rise when a stone is dropped inside? Because matter must ___.
11. This state of matter has a definite shape and a definite volume.
13. A liquid takes the shape of its container because it has an ___.
14. To make a shadow on the wall smaller, a student should decrease the object's ___.
15. Anything that has mass and occupies space.
19. The amount of matter in an object, measured in grams or kilograms.
20. Light from a torch travels in ___ to form sharp shadows of objects.
23. This state of matter has no definite shape and no definite volume.
25. Light behaves like a ball hitting a wall when it hits a mirror and begins to ___ off.