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Sediment carried by the river acts as an abrasive against the rocks on the bottom of the river. Rocks are also continually bounced into each other, which also serves to gradually knock off rough edges, making them smoother and rounder.

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Why are large pebbles near shore?

Large pebbles near the shore are typically deposited by wave action. As waves hit the shore, they can pick up and transport larger rocks and pebbles, eventually depositing them closer to the shore. The size of the pebbles also helps to protect the shore from erosion by dissipating the energy of the waves.


What type of rock is the boulder on the lake shore made of where did it form and how did it get out of the ground?

The boulder on the lake shore is likely made of sedimentary rock, such as sandstone or limestone, due to its smooth appearance and location near a body of water. It formed through the accumulation and compression of sediment over time. The boulder was likely transported by glaciers during the last ice age, as they can move and deposit large rocks far from their original location.


Why are rocks always jagged?

Most rocks are very hard and brittle. When they break they shatter. Rocks that are found along the shore line of the ocean and rocks that are found in river bottoms are very smooth. The water, sand and dirt that constantly flows over them polishes them removing all rough edges.


Is the salt content the same at the shore vs out to sea?

No, the salt content at the shore is typically lower due to the influx of freshwater sources like rivers and streams, while the salt content increases as you move further out to sea where evaporation concentrates the salt in the water.


What are steady movement of smooth waves near the shore?

Those are called swells. Swells are long-crested waves that have traveled from their area of origin to the shoreline and can provide a consistent and smooth wave pattern for surfing or other beach activities.

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