Measurements of water quality were taken from a river downstream from an abandoned chemical dumpsite. concentrations of a certain chemical were obtained from 9 measurements taken at the surface of the water, 9 measurements taken at mid-depth of the water, and 9 measurements taken at the bottom of the water. what type of study was conducted, and what is the response variable of the study?

" An observational study was conducted and the response variable is the concentration of the chemical"

Explanation:

" An observational study was conducted and the response variable is the concentration of the chemical"

Here,

the observations are being taken i.e the measurements are made about the concentration of a certain chemical.

In observational study, the observer measures or observes the response without altering or intervention with the source.

Response variable is the quantity or response which is to be observed to know its impact or to explain the measured quantity.

answer is: naturally occurring solid, inorganic compound or element is mineral.

minerals usually have crystalline form, that means than crystal constituents (atoms, molecules or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.

for example magnetite is a mineral of iron oxide (fe₂o₃).

calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (caco₃).

dolomite is an   carbonate mineral composed of calcium magnesium carbonate (camg(co₃)₂).

2b2t

explanation:

2b2t