Prepare a picture of/book about/Earth in advance, as well as a globe, and samples of fresh water and salty water.
Say: Look at this picture. (Show a picture of Earth.) This is Earth ¨the blue planet¨.
Earth, also called the world, is the largest of the Solar System's four terrestrial planets, and the only astronomical object known to accommodate life! (Point to the blue color on the globe) Say: Because we have so much water, Planet Earth is called the ¨Blue Planet¨. From space the oceans combined with the atmosphere makes the planet look blue. This water comes in many forms, each with its own special properties. Rain is essentially pure water (consisting only of H2O with other compounds picked up from atmospheric dust), while fresh spring water and most lakes and rivers contain more dissolved salts. (approach the tiny plastic glass of fresh water and ask the baby to taste it) Say: Taste its freshness, baby!) Ocean water is much more salty and has on average 3.5% salt content, also referred to as ¨salinity"(now, give the baby a drop of salty water) Say: taste how salty it is; do you realize the difference in taste?) . In addition to water, living things also need nitrogen, oxygen, and carbon dioxide. Earth's thin layer of atmosphere provides all of these elements. Animals and plants live almost everywhere on the surface of Earth. So, these organisms can live on Earth because it has an atmosphere. The atmosphere moderates daytime and nighttime temperature swings. The atmosphere filters radiant energy during the day, preventing the surface from overheating. At night the atmosphere prevents most of the radiant heat from escaping back into space, keeping the surface warm. The land on Earth is made of several plates and at one time all of these plates were joined together, making it possible to walk from one side of the Earth to the other. Plates are individual pieces that are always moving. So the land keeps drifting apart slowly. Today there are seven distinct lands known as continents. Finally, Earth is truly a remarkable planet. It is the only planet in our solar system that has the components necessary to support life as we recognize it. The planet is only a tiny part of the universe, but it is the home of human beings and many other organisms. We need to take care of our blue planet ¨Earth¨ and keep it clean and healthy. Remember ¨The earth is our home, we promise to keep it.
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