Which statement about erosion is true?

• A. Erosion is influenced by climate, topography, tectonic activity, and vegetation slows erosion.
• B. Erosion is influenced only by tectonic uplift.
• C. Erosion does not depend on vegetation.
• D. Erosion is unaffected by climate.

Answer: (A)

Erosion is controlled by multiple factors that work together in shaping how soil and rock are worn away and moved. Climate influences how much weathering happens and how much sediment is transported—rain, snow, and temperature changes drive weathering and runoff, while wind can move loose grains in dry areas. The land’s shape and steepness (topography) determine how much energy water, ice, or wind have to pick up and carry material; steeper slopes and higher relief usually mean faster erosion. Tectonic activity creates and maintains those gradients by uplifting land and forming mountains, which enhances erosion as rivers cut downward and rock is exposed to weathering. Vegetation helps slow erosion by stabilizing soil with roots, protecting the surface from raindrop impact, and increasing water infiltration, all of which reduce the amount of sediment that gets erased away. Because erosion responds to climate, landform, tectonics, and vegetation, a statement that includes all these influences—and notes that vegetation slows erosion—is the best description. The other options imply erosion depends on only one factor or that climate and vegetation don’t matter, which isn’t supported by how erosion actually works.