Mountains and Landscapes:
* Massive, jagged peaks: Without erosion to wear them down, mountains would continue to rise, forming incredibly sharp and unstable peaks. These would be prone to landslides and rockfalls.
* No valleys or canyons: Erosive forces carve out these features. Without them, the landscape would be a monotonous, undulating surface.
* No beaches: Beaches are formed by the erosion of coastlines. They would vanish, leaving cliffs plunging directly into the sea.
Soil and Life:
* No fertile soil: Weathering breaks down rocks into soil, providing the foundation for plant life. Without it, the Earth would be covered in barren rock.
* Plant and animal extinction: The lack of fertile soil would make it impossible for most plants to grow, leading to a massive extinction event across the animal kingdom.
* Rivers choked with sediment: Without erosion to transport sediment, rivers would become choked with silt and debris, becoming stagnant and uninhabitable.
Other Changes:
* A very different climate: Weathering and erosion play a role in regulating the Earth's climate. Without them, the planet would be hotter and drier.
* Unstable atmosphere: The breakdown of rocks releases carbon dioxide into the atmosphere, a crucial component of the carbon cycle. Without weathering, the Earth's atmosphere would become depleted of this vital gas.
In short, a world without weathering and erosion would be a barren, lifeless, and incredibly hostile place.
It's important to remember that weathering and erosion are natural processes that are essential for life on Earth. They play a crucial role in shaping our planet's landscapes, creating fertile soil, and regulating the climate.
