weather and nature

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Across
  1. 1. It grows in a very dense, short clump。
  2. 3. It's round. It appears in the daytime sky every day.
  3. 4. Its white and cold in winter.It fly in sky.
  4. 5. They are tough. They have to go through the wind and rain.
  5. 6. Its changeable.It has many form.
  6. 7. It's round. Every day it appears in the night sky.
  7. 8. It falls from the sky drop by drop.
Down
  1. 2. These day make people feel warm and hot.
  2. 4. It can lift the roof when it gets stronger.
  3. 6. If today is windy, It will apper and cool.