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In this activity (on page 8), learners model how marble statues and buildings are affected by acid rain.

1 cent - $1 per student Ages 6 - 14 10 to 30 minutes
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Exponga estos pósteres en el salón o déjelos donde los chicos los puedan explorar. Los chicos buscan las respuestas en línea, en libros de consulta, y en calendarios y almanaques.

free Ages 4 - adult 10 to 30 minutes
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In this design challenge, learners will engineer a structure and see if it can survive an earthquake they create.

free Ages 8 - adult 1 to 2 hours