Sedimentary rocks originate:in magma chamberswithin the Earth's crustinside volcanoesat the Earth's surfaceat the bottom of oceans

Sedimentary rocks originate through a series of processes that occur over time. Here are the steps:

1. Weathering: The first step in the formation of sedimentary rocks is weathering. This is the process by which rocks are broken down into smaller pieces through physical, chemical, or biological means. Weathering can occur due to factors such as wind, water, ice, or even living organisms.

2. Erosion: Once the rocks are weathered, the next step is erosion. Erosion is the transportation of the weathered rock fragments from their original location to a new location. This can happen through the action of wind, water, or ice.

3. Deposition: After the rocks are eroded, they are deposited in a new location. This can be in bodies of water such as rivers, lakes, or oceans, or on land in the form of sediment layers.

4. Compaction: As more and more sediment is deposited, the weight of the overlying layers causes the sediment to become compacted. This means that the grains of sediment are pressed together, reducing the amount of space between them.

5. Cementation: The final step in the formation of sedimentary rocks is cementation. This occurs when minerals in the groundwater fill in the spaces between the sediment grains and bind them together. This process creates a solid rock.

So, to answer your question, sedimentary rocks originate at the Earth's surface, at the bottom of oceans, or in bodies of water such as rivers or lakes where the processes of weathering, erosion, deposition, compaction, and cementation take place.