Across
- 4. 78%OF THE EARTH IS COVERED WITH THIS GAS
- 5. THIS IS THE FIRST LAYER OF THE ATMOSPHERE
- 6. THIS IS A BLANKET OF AIR SURROUNDS THE EARTH
Down
- 1. THIS IS A GAS WHICH HELPS PLANTS DO PHOTOSYNTHESIS
- 2. THIS GAS IS MAINLY NEEDED BY HUMAN BEINGS
- 3. THE LAST LAYER OF THE ATMOSPHERE