Slope is not just a term for skiing, it is also a mathematical term for expressing change in a vertical position with change in horizontal position. The term pitch is used to describe the slope of a roof. Another term used by ship captains, road builders, and truck drivers is grade. Grade describes the slope of a river or road. Gradient is a term used to describe the rate at which a road, railroad track, or a river channel rises or falls.
All rivers have a gradual slope and eventually flow into a larger body of water such as an ocean.
The Mississippi River flows into the Gulf of Mexico which is part of the Atlantic Ocean. The Nile River in Egypt flows north into the Mediterranean Sea. Graphs are useful pictures of numbers that help us discover or understand information. Graduations are a series of marks for measuring that are equal in distance or value. For example, if the data consist of the numbers 3 to 76 it is wise to make your graduations in either units of 5 or 10.