The correct options are
B Groundwater is always found inside the layer of the Earth, unlike surface water.
C Groundwater can be found even under a rock.
D Surface water usually has fewer nutrients than groundwater.
Groundwater is located underground in large aquifers and must be pumped out of the ground after drilling a deep well. Surface water is found in lakes, rivers, and streams, even the rain's wetland forms come under this category. Groundwater is water contained in or by a subsurface layer of soil or rocks. It is generally less contaminated than surface water because the rocks tend to act as filters to remove some contaminants.