The following graph is a ________. 
Definitions:
Correlation
A statistical measure that describes the extent to which two variables change together, but not necessarily causally.
pH
A scale used to specify the acidity or basicity of an aqueous solution, with values ranging from 0 to 14.
Hardness
A measure of a material's resistance to deformation, indentation, or scratching.
Hydrometry
The science of measuring water properties, such as flow, depth, and velocity, often used in the management of water resources.
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