The concept of change involves both time and space. Geographical phenomena are constantly changing, and can often be best understood by investigating how they have developed over time periods ranging from a few years to thousands of years. This is important in helping students to understand what is happening around them and to see their world as dynamic. In History, change refers to aspects of life or of a society that have changed or developed over time. The causes of change, or the resistance to change, can be investigated, along with the nature and pace of change and the impact of change.