Question

Sediment spreads horizontality and it goes from youngest on top to oldest on bottom. When sediment deposits in water, it also spreads flat in all directions until it either runs out of material and pinches off or it hits a barrier. This is known as the _____.

Answer 1

It is known as the sedimentation.. this process spreads widely (horizontally) keeping the youngest on the top and the oldest at the bottom..
hope this helps:)

Answer 2

Answer: The answer is that the deposition of sediments initially extends laterally in all the directions, laterally continuous which is known as the law of original lateral continuity.

Layers of sediments do not extend indefinitely, the limits can be recognized and are controlled by the shape and size of the sedimentary basin.

The sediments when reaches into the water it lies flat in all the directions, until it runs out of the material and pinches off or it hits the barrier.