Erg (landform) when liquid methane rained and eroded the ice bedrock, possibly in the form of flash floods. Alternatively, the sand could also have come from organic solids produced by photochemical reactions in Titan's atmosphere. Erg (landform) An erg (also sand sea or dune sea, or sand sheet if it lacks dunes) is a broad, flat area of desert covered with wind-swept sand with little or no vegetative cover. The term takes its name from the Arabic word "ʿarq" (), meaning "dune field". Strictly speaking, an erg is defined as a desert area that contains more than of aeolian or wind-blown sand
What Is a Nation? Anderson also points out that the reason many French citizens of Renan's time knew anything of these massacres was because they learned of them in state-run schools. Thus, the state itself preserved the knowledge which needed to be forgotten for national identity. In a 1995 book, "For Love of Country: an essay on patriotism and nationalism", Maurizio Viroli called Renan's essay "the most influential late nineteenth-century interpretation of the meaning of nation", because of its focus on the "spiritual principle" as opposed to race, religion or geography. Other authors, like Joxe Azurmendi, consider that really there is no such opposition