There is no liquid that is more critical to our survival than water. It is all around us and it exists even in place where we don’t expect it or cannot see it. It is always recycled, in different forms, so we basically use the same water in cycles. It is not an exaggeration to say that there would be no life on our planet without water. Even our bodies are mostly made of water, which accounts for over 75% of our body mass.

Key Takeaways:

  • Water performs a number of functions in the human body, including regulating temperature.
  • Only about 3% of the water on our planet is freshwater from rivers, lakes and glaciers.
  • The water cycle involves the transformation of water from solid to liquid to gas.

“Transportation was at first carried out on waterways . Ancient civilizations traded goods across the Mediterranean Sea . Today oil, coal, wheat and other products are transported on waterways.”

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