1.Hillock (Statement 1: Correct)
Ranging is obstructed because you cannot see over or through a hill to align points directly.
Chaining is possible because you can physically measure the distance over the slope using
stepping or reciprocal methods. Thus, it is an obstacle to ranging but not chaining.
2.River (Statement 2: Incorrect)
Ranging is possible because you have a clear line of sight across the water to align points on
the opposite bank.
Chaining is obstructed because you cannot directly walk across with a chain. The statement
incorrectly reverses this definition.
3.Building (Statement 3: Correct)
Both ranging and chaining are obstructed because a building completely blocks your line of
sight and prevents you from measuring a direct path through it.