Sea-riously fun puzzle

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Across
  1. 1. I'm tall but I'm not a tree. I shine but I'm not the sun. I help sailors but I'm not an anchor. I'm a building but I'm not a skyscraper. What am I? (9 letters)
  2. 5. What do turtles, eggs, and beaches all have? (6 letters)
  3. 7. I'm shiny and smooth, tossed to and fro, found on the shore where the ocean waves go. What am I? (7 letters)
  4. 8. Where do you find an ocean with no water? (3 letters)
  5. 9. Aminah's first word? (4 letters)
  6. 10. In the sea, I roam free, with a pointed horn and a mythical glee. What am I? (7 letters)
  7. 11. What is covered in holes, but can still hold water? (6 letters)
Down
  1. 2. What fish is the brightest? (7 letters)
  2. 3. I sound like I would be good with peanut butter, but you wouldn't want to make a sandwich with me. I'm fun to look at but not to touch. (10 letters)
  3. 4. You might get to one by airplane. Or you might prefer to go by boat. As it's surrounded by water. But it's not a castle with a moat. What is it? (6 letters)
  4. 6. I am solid in freezers, in rivers I flow, my chemical formula is H2O (5 letters)
  5. 7. I measure time, I build up castles, and I'm small enough to fit in a teaspoon. What am I? (4 letters)