What is "erratics"

Usage examples of "erratics".

Like most of Northern Ontario in either universe, the ground here was strewn with erratics: boulders deposited by glaciers that had receded at the end of the Ice Age.

Wind erosion and the marvelous erratics created by volcanic bombardment from Olympus Mons gave the expedition members a lot of features to discuss: beach terracing from long-lost lakes, meandering streambeds, lava bombs shaped like giant teardrops, or colored in a way that implied certain gases in copious quantities in the Hesperian atmosphere.

Wind erosion and the marvellous erratics created by volcanic bombardment from Olympus Mons gave the expedition members a lot of features to discuss: beach terracing from long­lost lakes, meandering streambeds, lava bombs shaped like giant teardrops, or coloured in a way that implied certain gases in copious quantities in the Hesperian atmosphere .