Scientists know that gravity cause sediment to be deposite.
The topmost rock layer is the one that was deposited last, as rock layers are typically deposited in a vertical sequence with the oldest layers at the bottom and the youngest layers at the top.
Sedimentary
sedimentary
sedimentary
New rock layers are always deposited on top of existing rock layers. Therefore, deeper layers must be older than layers closer to the surface. This is the law of superposition.
a rock formed by unconsolidated sediment deposited in layers
The boundary between older rock layers and newly deposited rock layers is typically marked by a disconformity. This type of unconformity occurs when there is a period of erosion or non-deposition that results in a gap in the geologic record, with the older layers being relatively horizontal. The newly deposited layers sit above the eroded surface of the older layers, indicating a break in the geological time.
sedimentary rock
Sandstone is a sedimentary rock. Sedimentary rocks form from sediments that deposited by the wind and water. Over the time those sediments will get pressed and cemented together. It can take millions of years for sediments to become a rock. So the oldest layers of a sandstone are on a bottom.
Broken pieces of sedimentary, igneous, or metamorphic rocks can be deposited into layers and cemented together to form sedimentary rock.
No, typically the layers of rock near the surface are the youngest rocks, as they have been deposited more recently. The deeper layers are usually older as they were deposited earlier in time. This is known as the principle of superposition in geology.
Sedimentary Rock That Forms Where Of Organisms Are Deposited In Thick Layers.