This document outlines 9 fundamental concepts in geomorphology. It introduces geomorphology as the description and interpretation of earth's landforms. Some key concepts discussed are: - The principle of uniformitarianism, which states that geological processes have operated consistently over time, though intensities may have varied. - Geological structure strongly influences landform evolution and is reflected in topography. - Individual geomorphic processes leave distinctive imprints and develop characteristic landform assemblages. - Landforms develop through successive stages as erosional processes act on the earth's surface over time. - Most of the world's topography developed during the Pleistocene and is influenced by past geological and climatic changes.