what is a biosand filter?\na concrete or plastic box that is filled with layers of sand and gravel\na…
what is a biosand filter?\na concrete or plastic box that is filled with layers of sand and gravel\na concrete or plastic box that is filled with active carbon and chemicals\na paper box that is filled with rice husks or coffee husks\na paper box that is filled with different minerals
Answer
Brief Explanations:
A biosand filter is typically a concrete or plastic box filled with layers of sand and gravel which aid in water - purification through physical and biological processes. The other options describe different types of containers and fillings that are not characteristic of a biosand filter.
Answer:
A. A concrete or plastic box that is filled with layers of sand and gravel