Logical/mathematical intelligence

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Across
  1. 5. I am a Number that if you multiply it by two and then subtract four I would make a six.
  2. 6. The closest planet to the Sun.
  3. 7. The more you take, the more you leave behind. What am I?
  4. 8. Figure, has four corners with the same angle.
  5. 9. What runs but never walks, has a bed but never sleeps?
Down
  1. 1. What compound word refers to a tall plant with a large yellow bloom that faces the sun?
  2. 2. What has a face but no eyes, hands, or legs?
  3. 3. If a tree grows 10 cm each year and is now 2 meters tall, how old is it?
  4. 4. What is a word that means the same as “big”?
  5. 6. What has cities but no houses, forests, or rivers?