Examlex
Highly impermeable layers such as compacted clay or shale are known as______ .
Primary Research
Collection of original data through firsthand investigation, such as surveys, interviews, or experiments.
Experiments
Systematic procedures carried out to test hypotheses, observe effects, and study relationships between variables.
Secondary Research
The process of gathering existing data from previously conducted studies and analyses, which are available in books, articles, and online resources.
Ethnographic Research
A qualitative research method focusing on the systematic study of cultures and peoples through observation and participatory involvement.
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