Word Bank: microscope, rivers, physical, space, glaciers, weathering, elements, analog, topographic map, NASA, satellite, deposition, landforms Earth's sulface and it's landforms are always changing. Scientist can use tools such as teachnology in order to photographt these changes from . The picture are then studied in order to identify changes to the land over time. The changes due to events such as the of sediment, the movement of , and courses of can be observed by viewing a series of topographic maps or satellite views that were taken over a period of time.​