In this lesson, you will investigate changes that happen in materials under the two conditions which are the (1) presence or lack of oxygen and (2) application of heat. In the previous lesson, you discovered that properties of materials tell about their uses or importance, or whether they are useful or harmful. When these materials combine with other substances, they will undergo changes in their properties. There are two ways by which materials change. Physical change happens when the materials change in shape or size but the substances or particles making up the materials are still the same. These changes are directly observed like when you cut or slice an apple. There are changes in shape and size of an apple but the material is still the same. Aside from cutting, there are also other processes that cause changes in the materials. These include bending, dissolving, freezing, boiling, shredding and melting. The breaking of glass into pieces is also an example of physical change. Change in the state of matter from solid to liquid or from liquid to gas is also an example of The pictures below show the different processes that cause physical change. Examine each picture below. What do you think will happen to its properties after each process ? please answer it nonsense report​