Until recently, the oldest evidence of life on land was only 2.8 billion years old, whereas the oldest evidence from the sea was 3.7 billion years old. (newscientist.com)
Their world is split between people who live on land and those who live on the water in boats. (puppiesandpretties.com)
This school cycle made sense when half the nation's population lived on the land. (ascd.org)