"Earth (Planet)" . . "Juvenile works"@en . . . . "Professor Verne and his friends find out how the Earth was formed, and examine natural features and phenomena such as rock types, continental drift, volcanoes and earthquakes. Suggested level: intermediate, junior secondary."@en . . "The centre of the earth"@en . "The centre of the earth" . . . . . "The centre of the Earth"@en . . . . . . .