By The Sea

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Across
  1. 3. polar bears are known to be very good at this
  2. 5. Sebastian Steudtner has the world record for riding the biggest of these
  3. 6. Chlorophyta is a type of this word
  4. 7. Tangs are a type of this animal
  5. 10. the Indian is one of these
  6. 11. 75% of the human brain is made of this material
  7. 12. Abalone is a type of this material. It can be used for decoration
Down
  1. 1. the SS Minnow from Gilligan's Island is one of these
  2. 2. Copacabana is a famous one found in Rio De Janeiro
  3. 4. largest known animal to have ever existed
  4. 8. glass can be made from this material
  5. 9. Elkhorn is a species of this animal