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How do weathering and erosion change mountains and continents?

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volcanology — Earth sciences Geologist using a rock hammer to sample active pahoehoe lava for geochemical analysis on the Kilauea volcano, Hawaii, June 26, 2009.

Weathering and erosion are fundamental geological processes that continuously reshape Earth's surface, acting as the primary forces that counteract tectonic uplift.1

Weathering

Weathering is the in-situ disintegration or alteration of rock at or near the surface through physical, chemical, and biological processes. It breaks down solid rock into smaller particles or changes its mineral composition, making the material susceptible to removal. This process is influenced by climate, rock texture, and mineral composition.2

Erosion

Erosion involves the removal and transportation of this weathered material by natural agents such as water, wind, and ice. While weathering weakens the rock, erosion acts as the transport mechanism that carries debris away from its original site.32

Impact on Mountains and Continents

Mountain Destruction: Mountains exist because tectonic forces create high elevations, but erosion works to destroy them. Over time, these processes reduce the size of mountain ranges, eventually leaving behind residual mountains or low-elevation chains.14
Landscape Molding: The interaction of these processes creates diverse landforms, such as valleys, ridges, and coastal features.34
Sedimentation: Eroded material is transported and deposited elsewhere, forming new features like floodplains and deltas, which contribute to the ongoing evolution of continental surfaces.35