Question

where do you think sediment comes from?

Explanation:

Sediment can come from weathering and erosion of rocks. Weathering breaks rocks into smaller pieces. Erosion then transports these pieces (sediment) by agents like water (rivers, waves), wind (in deserts), ice (glaciers). For example, a river flowing over a rocky bed can erode the rocks and carry the sediment downstream. Also, biological processes can contribute. Plants can hold soil (a type of sediment) but when they die and decompose, along with the soil particles, they can be part of sediment. In coastal areas, the breaking of coral reefs (by waves etc.) can produce sediment (coral fragments).

Answer:

Sediment comes from weathering and erosion of rocks (by water, wind, ice), and also from biological processes (like decomposition of plants and breaking of coral reefs in coastal areas).