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The increased pressure from the compacted sediment forces water out from between the sand grains, causing it to be squeezed out and drained away. This compaction reduces the porosity and permeability of the sand, making it harder for water to flow through.
it gets weathered into sediment, then it gets washed into the ocean, sediment layers up over millions of years, and it gets squashed into sedimentery rock, then metamorphic and so on.
The process that presses sediments together is compaction. Thick layers of sediment build up gradually over millions of years. These heavy layers press down on the layers beneath them. The weight of new layers further compacts the sediments, squeezing them tightly together. The layers often remain invisible in sedimentary rock.
The time it takes for sediment to form can vary greatly depending on factors such as the type of sediment, environmental conditions, and the presence of organic material. In general, sediment deposition can occur slowly over thousands to millions of years, with layers building up gradually through processes like erosion, transportation, and deposition.
The Earth's basins may be sinking due to factors such as tectonic activity, sediment deposition, and compaction of sediment layers over time. These processes can lead to subsidence, causing the basins to gradually sink or lower in elevation.