February 2012
Feb 9th
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“冬、諏訪湖は氷結する。氷は、膨張した後に気温が下がると収縮する為、気温が下がる夜中に氷が収縮、亀裂が入る。その亀裂の隙間に水が入り、薄い氷ができる。日中、気温が上...”
– 諏訪湖 - Wikipedia (via petapeta)
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