Across
- 2. A piece of sand is caught inside the mollusk which builds a silky coat around the sand.
- 4. These veins are mixes of brown or grey rock when the ... was formed.
- 6. If you look closely at a piece of ... you might find some insects from that time period.
Down
- 1. This gem can be found in Brazil, India,South West Africa,Australia and Russia.
- 3. ... is one of the most common minerals on EARTH!!!
- 5. It was believed to protect a house from storms.