1.Change the sentences from Active to Passive.
1. He opened the weather stantion over 100 yers ago.
2. Water covers the Earth's surface.
3. Warm and cold air movement changes air pressure.
4. How will people predict weather in future?
 

The weather stantion was opened by him over 100 years ago.The Earth*s surface is covered with water.Air pressure is changed with warm and cold air movement.How the weather will be predicted by people?