A group of students were collecting soil samples near a river. One student noted there was a lot of sand in one of the samples. He said, “All this sand must have washed up from the beach where the river enters the ocean.” Another student said, “I think it came from the rocks in the mountains. But there aren’t any mountains near us. I don’t understand how the sand got there.”

What would you tell the students to help them solve where the sand came from?
(science)
answer below

they are made of gases.

they have a spherical shape.

they make energy through fusion.

l dont know l am s sorry

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.