The police of Norðurland Eystra took a picture of a sign post in front of the still-growing Holuhraun lava field on Saturday. The signpost has since been swallowed by the slow but inevitable tide of molten lava, reports Vísir. https://www.facebook.com/logreglannordurlandieystra/photos/a.1541183842800560.1073741835.1534713560114255/1541588386093439/?type=1&permPage=1 The situation…