The drought in Brazil bared rare ancient petroglyphs in line with the river

It only second similar supervision in the history. Archeologists for the first time since 2010 when there was a severe drought in Brazil, found new petroglyphs in a place of merges the rivers Province of Rio Negro and Amazon near Manaus. These petroglyphs represent the rare images of water beaten out in a stone, animal and human faces. Them from one thousand to two thousand years. Similar ancient "engravings" usually are forever lost under water. However the recent drought led to that the water level fell to record-breaking low level for more than century. Now scientists try to understand that mean these petroglyphs and who them...