Solve the crossword puzzle given below.

123456
Across
  1. 2. The horizontal movement of air. _________
  2. 3. The atmosphere is held on to the earth due to ___________.
  3. 6. A hill or a mound of sand deposited by the wind.
Down
  1. 1. The aggregate of day to day weather conditions over a long period of time. __________
  2. 4. The narrow opening of a volcano. ____________
  3. 5. Tremors and vibrations in the crust of the earth.