Final answer:
A line of constant bearing on the surface of Earth, cutting all meridians at the same angle, is called a rhumb line. A rhumb line is a path of constant bearing, making navigation easier.
Step-by-step explanation:
A line of constant bearing on the surface of Earth, cutting all meridians at the same angle, is called a rhumb line. A rhumb line is a path of constant bearing, meaning that if you were to follow a rhumb line on a compass, you would maintain the same angle or direction throughout your journey. Unlike a great circle, a rhumb line does not take the shortest distance between two points on Earth, but it is easier to navigate.