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- Steel (28384 bytes)
3: ...iron, but is also more [[brittle]]. One classical definition is that steels are iron-carbon alloys wit...
5: ... [[plasticity (physics)|plastically]] formed (pounded, rolled, etc.).
8: ...l><sub>2</sub></small>— [[Pyrite]]. Iron oxide is a soft [[sandstone]]-like material with limite...
11: ...similarly soft and metallic but can dissolve considerably more carbon (as much as 2.04 wt% carbon at 1...
13: ...ry similar unit cell structure to austenite, and identical chemical composition. As such, it requires... - Pytheas (6447 bytes)
1: ...nd 320 BCE. Pytheas was the first Graeco-Roman to describe the [[Midnight Sun]], the [[Polar Aurora|au...
4: ...e Moon. In northern [[Spain]], he studied the [[tide]]s, and may have discovered that they are caused ...
6: ...es, Land's End, Plymouth, Isle of Man, Outer Hebrides, Orkneys, Iceland, Britain's east coast, Kent, [...
8: ... took advantage of a temporary lapse in the blockade, known to have taken place around the time he tra...
10: ...ek as ''Prettanike'', which [[Diodorus]] later rendered ''Pretannia''. This supports theories that the... - Extreme points of the world (6602 bytes)
4: ===Latitude and longitude===
6: ...north of [[Cape Morris Jesup]], [[Greenland]] (83°39'). Various shifting [[gravel bar]]s lie furt...
11: ===Altitude===
13: ...ttp://www.rain.org/ocean/ocean-studies-challenger-deep-mariana-trench.html].
14: * The lowest point on land is the shore of the [[Dead Sea]]: 417 [[metre|m]] below sea level. ''See [... - Atlantis (41399 bytes)
2: ...own time. Plato did mention it was somewhere outside the [[Pillars of Hercules]] (i.e. the [[Straits o...
7: ...m his grandfather also named Critias, son of Dropides.
12: ...intended to illustrate Plato's philosophy of the ideal government. Plato's account purports to be base...
14: ... of [[Gades]] (Greek, [[Eumelus]]; Atlantean, [[Gadeirus]]).
17: ... come from the continent beyond the islands, in order to offer sacrifice to the gods of the ocean. - Thulium (8549 bytes)
2: {| border="1" cellpadding="2" cellspacing="0" align="right...
4: {| align="center" border="0"
8: '''Tm'''<br>[[Mendelevium | Md]] <br> <br>
20: | [[Lanthanide]]s
25: | [[Density]], [[Mohs hardness scale|Hardness]] - North Pole (13759 bytes)
3: ...net's North Pole. [[Earth]]'s Pole, however it is defined, lies in the [[Arctic Ocean]].
5: ==Defining North Poles in astronomy==
6:
8: For the magnetic poles, their names are decided upon by the direction that their field lines eme...
14: ...de lies the ''trailing pole''. Io can thus be divided into north and south hemispheres, into pro- and ...
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