Which outcome occurs when terrace steps degrade and collapse during cultivation of maize?

💡 Explanation

Increased erosion occurs because terracing relies on stepped contours to reduce runoff; when the terrace steps fail, the slope length effectively increases. This increases the water velocity, therefore more soil is carried away rather than retaining soil and water with well-maintained steps.

• Which limitation influenced Ibn al-Haytham’s understanding of light refraction through spherical lenses?
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