Historical clue formulations

• Part of the Ring of Fire — 2013-04-13
• Discovery of Vitus Bering before his shipwreck — 2012-02-03
• Locale of more than 50 volcanoes — 2006-10-20
• Places for seals — 2003-02-07
• Unalaska and others — 2001-07-07
• Japanese attack site, June 1942 — 2000-11-24