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The two primary sources of sediment for beaches are rivers and coastal erosion. Rivers transport sediments from the land and deposit them along the coast, while coastal erosion breaks down rocks and cliffs along the shoreline, contributing sediment to the beach.

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What are the two primary causes of lithification?

The two primary causes of lithification are compaction, where sediments are squeezed together by the weight of overlying layers, and cementation, where minerals precipitate and bind sediment grains together. These processes transform loose sediment into solid rock.


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Two main human sources of primary air pollutants are industrial activities, such as burning fossil fuels and manufacturing processes, and vehicle emissions from transportation including cars, trucks, and planes.


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Two types of human activities causing coastal erosion are construction of coastal structures like seawalls and dredging of sand from beaches. Seawalls disrupt natural sediment flow, leading to erosion downstream, while dredging reduces the natural supply of sand that replenishes the beaches.


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The two primary energy sources that drive the food chain are sunlight and organic matter. Sunlight is needed for photosynthesis to produce plant matter, which is then consumed by animals for energy. Organic matter is essential for decomposers to break down dead organisms, recycling nutrients back into the ecosystem. Having two energy sources allows for a more efficient transfer of energy between trophic levels in the food chain, ensuring a balanced and sustainable ecosystem for all organisms.

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What are the two primary causes of lithification?

The two primary causes of lithification are compaction, where sediments are squeezed together by the weight of overlying layers, and cementation, where minerals precipitate and bind sediment grains together. These processes transform loose sediment into solid rock.