A. Fill in the blank spaces by choosing the correct words from the given list.
List: Oxygen, carbonic, sulphur dioxide gas, precipitation, helium
4._____________ gas is used for filling weather observation balloons.

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Solution

For two reasons, helium is used to fill weather balloons:
1. It is lighter than air, with a density of roughly one-eighth that of air, allowing it to travel upward in the atmosphere for weather forecasting.
2. Unlike hydrogen, it is inert and non-flammable, so there is no chance of explosion.
So, helium gas is used for filling weather observation balloons.

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