Answer: Air Quality Index
Explanation:
An air quality index can be define as the index which is introduced by the U.S Environmental Protection Agency. It gives idea about how clean or polluted the air is. It helps in forecasting of the air pollution. The elevation in the levels of the AQIs indicates that public is at high risk of respiratory diseases associated with the air pollution.
England
Explanation:
It was named after the Duke Of York
Answer:
1 and 3
Explanation:
1.Melting is a reversible change because it can be frozen back to its original state.
3. Decomposition involves breaking down of large substances into new smaller ones with release of energy which is similar to a chemical reaction
2. Decomposition isn’t usually reversible because new substances have been formed due to microbes and environmental conditions. A decayed substance can’t be changed back to its original form
