Velocity. the difference between speed and velocity is speed can tells us how fast an object is moving, velocity tells us how fast and object is moving and in which direction (North, South, East, west)
Running water is the leading cause of soil erosion, because water is abundant and has a lot of power. Wind is also a leading cause of soil erosion because wind can pick up soil and blow it far away.
Meridians of longitude i think XD
