About 4.5 billion years ago, the earth was a ball of fire covered with volcanoes. Steam and other gases escaped into the atmosphere. Then the earth cooled and all the steam in the atmosphere condensed and fell as rain. The rainwater filled the hollows and the oceans and lakes were formed. If all the land were pushed together to form one mass, it would occupy only one third of the surface. The remaining two thirds would be covered with water. The water supports life as we know it, giving our earth the name “LIVING PLANET”. Our earth is also called the BLUE PLANET because of the large quantities of water, which when seen from outer space, give the planet a blue hue.