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pyrite
(Encyclopedia)pyrite pīrīˈtēz, pə–, pīˈrīts [key], pale brass-yellow mineral, the bisulfide of iron, FeS2. It occurs most commonly in crystals (belonging to the isometric system and usually in the form of...metallurgy
(Encyclopedia)metallurgy mĕtˈəlûrˌjē [key], science and technology of metals and their alloys. Modern metallurgical research is concerned with the preparation of radioactive metals, with obtaining metals econ...Rockhampton
(Encyclopedia)Rockhampton, city and region (2016 pop. 79,726), Queensland, E Australia, on the Fitzroy River. It is a rail center and, with its port at Port Alma, the principal trade center for the pastoral and min...Skellefteå
(Encyclopedia)Skellefteå shĕlĕfˈtəōˌ [key], city (1990 pop. 31,050), Västerbotten co., NE Sweden, on the Skellefteälven River inland from its mouth on the Gulf of Bothnia. The center of a rich mining regio...Skellefteälven
(Encyclopedia)Skellefteälven shĕlĕfˈtəĕlvˌĕn [key], river, c.255 mi (410 km) long, rising in Norrbotten co., N Sweden, in the mountains along the Norwegian border. It flows SE through Uddjaur lake (30 mi/48...Estremadura, region, Portugal
(Encyclopedia)Estremadura əshtrəmədo͞oˈrə [key], region, W Portugal, formerly a province, now divided between the provinces of Estremadura and Ribatejo, with a small part in Beira Litoral. Estremadura provinc...Joensuu
(Encyclopedia)Joensuu yôˈĕnso͞o [key], city (1998 pop. 51,113), Eastern Finland prov., SE Finland. It is the trade center of the forest region of NE Karelia, has plywood mills, and is an important lake port. It...Jaén
(Encyclopedia)Jaén häānˈ [key], city (1990 pop. 109,338), capital of Jaén prov., S Spain, in Andalusia. It is a marketing and distribution center for a fertile area producing olive oil and wine. Nearby lead mi...intrauterine device
(Encyclopedia)intrauterine device (IUD), variously shaped birth control device, usually of plastic, which is inserted into the uterus by a physician. The IUD may contain copper or levonorgestrel, a progestin (a hor...Ndola
(Encyclopedia)Ndola əndōˈlä [key], city (1990 est. pop. 376,311), N central Zambia, near the Congo. It is a commercial, mining, and manufacturing center, located in the Copperbelt. Copper mining in Ndola long a...Browse by Subject
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