Gravity well Z

 

1. Gravity well  - for pupils 9 + years old only.  Includes spacetime.
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3. 'Spacetime' is included on another of my sites here under the large blue globes.
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5. Take plenty of time with 9 and 11 in stages of, say, 30 minutes for both pages. 11 sets the stage for more advanced learning at Sec Mod.