Question

One student did an experiment with sand, rocks, pebbles, and water. The steps of the experiment are shown below.

Cut out the bottom of a two liter plastic bottle.
Remove the cap of the bottle and fix a loosely woven cotton cloth on the mouth of the bottle with the help of a tape.
Fix the cap tightly on the cotton cloth.
Put a cup of sand into the bottle through the opening cut out at the bottom.
Pour water slowly into the bottle.
Open the cap and observe how the water flows out of the bottle through the cotton cloth.
Empty the bottle and replace the cap.
Repeat the experiment by putting a layer of rocks, pebbles and sand in the bottle.

What does the student's experiment most likely demonstrate?

Select one:
a. groundwater reacts with sand, rocks, and pebbles
b. groundwater corrodes sand, rocks, and pebbles to form caverns
c. groundwater causes layers of sand to collapse and form sinkholes
d. groundwater moves at different rates through different layers of the Earth

Answer 1

D. groundwater moves at different rates through different layers of the Earth

Answer 2

The intended observation in this experiment is to check the flow of water through the cotton cloth when pouring the water through different material (sand, rocks and pebbles).
We will observe that the rate of water flow changes depending on which material it is flowing through.
The used materials in this experiment (sand, rocks and pebbles) are the same as those forming different layers of the earth.

Therefore, based on the above explanation, we can infer that the best answer is:
D. groundwater moves at different rates through different layers of the Earth