| They used various materials such as lime, copper, silica, iron oxides, and chalk to produce numerous colors. |
| An aerogel is a porous network of silica strands with diameters of a few nanometres. |
| A recess is formed in the silica layer that is aligned with an active area within the semiconductor substrate. |
| Since silica can only limit diatoms, other forms of phytoplankton might dominate if nitrogen is regenerated more rapidly. |
| Several powders or dry colours use a base of asbestos, chalk powder or silica. |
| This occurs when finely divided amorphous silica particles combine with available lime to form a calcium silicate hydrate. |
