The vertical drop of a stream channel over a certain distance is called the

The vertical drop of a stream channel over a certain distance is called the-  gradient

The gradient of a stream is a measurement of the vertical distance which a stream channel falls between two points along its course.

ionic bonds are two oppositely charged ions that attract. a sodium ion has a 1 positive charge; a chloride ion has a 1 negative charge. sodium and chloride have oppostive charged ions that attract which forms an ionic bond. a chemical bond formed when two atoms share electrons is called