# GEOLOGY

## EARTH SCIENCE

### GROUNDWATER

 Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
A measure of a change in elevation over a certain distance is called
 A porosity B gradient C permeability D recharge zone E discharge zone
Explanation:

Detailed explanation-1: -The slope of a line is called the gradient . It may be defined as: The change in vertical distance or elevation* over a given horizontal distance, or the change in horizontal distance over a given vertical distance; The vertical angle made by the sloping line and a horizontal line.

Detailed explanation-2: -Slope can also be expressed as a gradient, which is the ratio between the elevation change of the slope and the horizontal length over which the change occurs. In algebra terms, it is the rise over the run. For example, if a slope drops 10 meters over a distance of 100 meters, it has a gradient of 0.1 (i.e., 10/100).

Detailed explanation-3: -The gradient of a line is the measure of the steepness of a straight line. The gradient of a line can be either positive or negative and does not need to be a whole number. The gradient of a line can either be in an uphill (positive value) or downhill direction (negative value)

Detailed explanation-4: -GRADIENT = ED/HD. Take a look at this example: The vertical distance (here, the difference in elevation between points ‘A’ and ‘B’) = 10, 000 feet. The horizontal distance from ‘A’ to ‘B’ = 5 miles. Gradient = vertical distance (elevation difference (ED)) divided by horizontal distance (HD)

Detailed explanation-5: -Gradient is simply the rise over the run or the slope (change in y (elevation) divided by the change in x (distance)). Gradient is equal to the elevation change divided by the horizontal distance.

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