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- Blast furnace (4721 bytes)
1: ...the chamber such that the [[chemical reaction]] does not take place only at the surface. Typically th...
4: ...|flux]]. The oldest known blast furnaces in the West were built in [[Sweden]] at Lapphyttan, sometime...
6: ... blast furnace-based iron smelting significantly less expensive.
8: ==Process==
9: ...ng combustion in the middle of the mixture. The results of this localized burning was a liquid that s... - Animal shell (2105 bytes)
3: ...se are unrelated materials (except for their hardness and use as a covering by animals).
5: ...nd then a layer of [[calcium carbonate]] (<nowiki>CaCO</nowiki><sub>3</sub>) in the form of platy [[crys...
7: ...he inner surface of the animal's shell (the [[iridescent]] ''nacreous layer'', also known as ''[[mothe...
9: ...rl]]s and continues for as long as the mollusk lives.
11: ...to [[limestone]]. Shells that wash up on [[beach]]es are called seashells, and are collected by some e... - Iron (23778 bytes)
5: <tr><td colspan="2" align="center">[[manganese]] – '''iron''' – [[cobalt]]</td>
19: <td>[[Chemical series]] </td><td>[[transit...
24: <td>[[Density]], [[Mohs hardness scale|Hardness]] </td>
30: ...lign="center" bgcolor="#ffc0c0">'''Atomic properties'''</th></tr>
48: ...gn="center" bgcolor="#ffc0c0">'''Physical properties'''</th></tr> - Trilobite (9216 bytes)
21: ...eight, possibly nine, orders and over 15,000 species. Most were simple, small marine animals that filt...
23: ==Physical description==
24: ...tary. The thorax is fairly flexible—trilobites are often found curled up like modern [[sow bug]]...
26: ...lobes and a central axial lobe that gives trilobites their name, ''not'' the division into cephalon, t...
28: ...llion years ago; the evolutionary appearance of eyes has been postulated as a trigger for the [[Cambri...
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