The warming of the earth caused by the green house gases is called global warming . The main green house gases are methane (CH4),H20, carbon dioxide (Co2), etc So these are produced mainly due to the excess amount of smoke and pollution produced by the factories and industries , we should try our level best to control and prevent … Read more

For class seven , A model of a WIND MILL really works .a wind mil produces a lot of electricity through air or water .it is very useful in the irrigation and houses . It is very useful in the conservation of thermal electricity as we are running out of the main resources like coal . 

Cell phones are not allowed in schools because , we come to school for studying and whenever the phone rings , the other students ,the class,and the teacher get disturbed Some students listen to musics ,chat and take photos in the school ......so the students should not carry mobile 

God is nothing but a power living in each and every one of us , but it takes time for us to realize him .God i.e the power is always alive  

Over a million people believe in Hinduism . The 75-80% of the people of India,which is the second populated country in the world believe and follow Hinduism 

Population growth leads to the shortage of food and property. In a country when the population is high, then the demand becomes larger than supply. This leads to loss of lives and famine.

Science and technology is very much useful in games and sports as well. Video games are one of the means of entertainment for young kids .So it is only with the help of science . It can be proved by a model of a car and a track .