Wonders 5.1.1 author who wrote the book

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Across
  1. 2. people who all have a common family ancestor
  2. 4. very unusual and impressive
  3. 5. author who wrote the book "Walden"
  4. 8. the 26th US President, who loved nature
  5. 9. use special force or stress when saying a particular word or syllable.
Down
  1. 1. showed a sign
  2. 3. a person who specializes in the study of things in nature
  3. 6. the scattered remains of something
  4. 7. an unexpected meeting