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

shield volcanos are angry and get mad over the smallest things so much that there heads erupt   pahoehoe and a'a lava. a composite volcano is the poller opposite of a shield volcano. its   peaceful thing and knows how to control its emotions.      

hurricanes form when warm, moist air from the ocean surface quickly rises into the atmosphere and forms storm clouds and rain. when the clouds are formed, heat is released which warms the cool air in the upper regions of the atmosphere so that the cycle can continue. which two phases of the water cycle are repeated in this process?

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the population of unionid mussels in the hudson river decreased after zebra mussels were introduced. zebra mussels, a nonnative species, competed with the unionid mussels for food. the zebra mussels were able to outcompete the unionid mussels, allowing the zebra mussel population to increase dramatically over six years. the unionid mussel population decreased due to a lack of food.

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