Geological processes shape landscapes over time through various mechanisms such as weathering, erosion, tectonic activity, and volcanic activity. Weathering breaks down rocks into smaller particles, while erosion transports these materials to different locations, creating landforms like valleys, canyons, and deltas. Tectonic activity, such as the movement of tectonic plates, can uplift mountains or create rift valleys. Volcanic activity can also build up landforms like volcanoes and lava plateaus. Over millions of years, these processes work together to shape the Earth's surface into the diverse landscapes we see today.