One student did an experiment with sand, gravel, food coloring and water. The steps of the experiment are shown below.
Fill about half of a plastic cup with layers of gravel and sand.
Pour water into the cup and observe it seep through the layers.
Add two drops of food coloring on one side of the gravel layer.
Observe the food coloring mix with the water.
What does the student's experiment most likely demonstrate?

movement of groundwater through sinkholes
movement of pollutants through the groundwater
chemical reaction between acid rain and groundwater
chemical reaction between groundwater and layers of earth

The experiments demonstrate the movement of pollutants through the ground water.

The sand and gravel make up the ground the water represents the ground water. The food coloring represents the pollutants.

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Surnia Surnia · Answer 2 · 2019-07-13T19:12:21+02:00

Answer: Movement of pollutants through the groundwater.

Explanation:

Groundwater is the water that accumulates below the surface of earth crust. This water forms the part of geosphere. The water from river, lakes, ponds and rain seep below the surface of ground through small pores present between the soil aggregates and rocks.

According to the given situation, sand and gravel forms the part of earth crust. The water here is the part of groundwater. The food coloring here is the example of pollutants which seep inside the pores present between the sand and gravel. Hence, polluting groundwater.