"earth" . "study of the origin of the earth" . "origin of Earth" . "The Earth's Origins" . "Earth's history" . "History of Earth" . "history of Earth" . . "survive on Earth" . "formed Earth" . "that time" . "origin of planet Earth" . . "history of the planet" . . . . "its past" . "Earth formed" . "earth history" . "Earth's early" . "History of Earth" . "History of nature" . "historical eras" . "Earth history" . "Earth's formation" . . "earth's history" . . . "history" . "the formation of the world" . . . . "1590 million years old" . "bizarre history" . "remote history" . "creation" . "origins of Earth" . "origin" . . "geological record" . . "proto-Earth" . "when it was formed" . . "natural history of the Earth" . "origin and evolution" . .