What describes a surface on which one end is higher than the other?

The term that best describes a surface on which one end is higher than the other is "slope." A slope is characterized by an inclined surface that rises or falls at an angle, creating a difference in elevation between its two ends. This concept is fundamental in various fields, including geography, engineering, and urban planning, as it affects water drainage, construction designs, and land use.

While "incline" might seem similar, it is more of a synonym for a slope and can refer to any form of upward or downward tilt without specifying the degree of steepness. In contrast, "gradient" often refers to the steepness or degree of incline of a slope but does not itself describe the surface. "Decline" generally indicates a downward movement or reduction and does not specifically refer to an angle or height difference in elevation. Thus, "slope" is the most precise term in this context to describe a surface that has one end elevated compared to the other.