Buildings and Earthquakes

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Across
  1. 2. What type of building survives high frequency waves?
  2. 4. The liquid in One Rincon Hill is used for?
  3. 6. Build up of vibrations from waves
  4. 7. Steel is added to concrete to reduce?
  5. 8. Best base for buildings
Down
  1. 1. Tuned mass dampers use..?
  2. 3. Why are tall buildings better suited against earthquakes?
  3. 5. Method the incas used