leonardo da vinci : the codex leicester

how did the different forms of rock develop?

the further a river progresses on its way to the sea , the more the river has reduced the size of the rocks it has carries away from the mountains: large angular blocks become smaller round stones, which become pebbles, which then become sand and ultimately mud. when it finally reaches the sea, the river is turbid with sand and mud. the river’s sand is deposited on the seashore, since it is heavier than the mud. the mud is carried into the sea and repeatedly washed back on shore. if the sea is calm , then the mud sinks and settles onto the sea bottom.






  1. is the earth a living body?
  2. why is there ebb and flow in the atlantic and the mediterranean?
  3. how did the different forms of rock develop?
  4. why can't the moon be responsible for ebb and flow?
  5. does ebb and flow occur when two rivers meet?
  6. did the rivers carve up the mountains?
  7. why is it that an object that would sink in calm water does not sink in moving water?
  8. how did the strait of gibraltar and the sinai mountain range come into being?
  9. how can one discover the origin of ebb and flow?
  10. can one influence the confluence of two rivers?
  11. which waves are particulary strong when a river swells up?
  12. how does water flow around two obstacles standing one after another?
  13. what forms of stone are created by rivers and seas?
  14. does a stone sink vertically to the bottom when its dropped into moving water?
  15. how can one make the movements of water visible?
  16. how does water flow around two obstacles standing near each other?
  17. how does water flow around three obstacles in a triangular formation?

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