4 The Life of a Glass Jar Glass jars are useful containers They are often used to hold food You have probably seen jars of jam at the store
When glass jars are empty they can be washed and used again Jars can be reused in this way for a long time Do you know what happens to a glass jar when you’re done using it 5
6 What Is Glass Glass jars have lids to keep things inside The lids are often made of metal Glass is hard and smooth It is often clear and shiny
Glass is made from sand The sand is heated until it melts Then it can be shaped into different objects such as jars Making new glass takes a lot of energy Reusing old glass jars instead of buying new ones helps save energy 7
