Bangladesh has a sub tropical monsoon climate by wide seasonal rainfall,high temperature and humidity. March to June is cool,June to October is rainy, October to June is dry winter .My students try to find out what is Climate,Why change the season? They were know in Bangladesh has six seasons, such as Summer, Rainy, Autumn, Late autumn, Winter, Spring. Now a day they can observe only three. Why it is ? They try to find out by allowing one week , At first i help them made an (Office mix) the cause all over our country then they will go to their community watch and write the cause by brainstorming.