Biogeneous sediments
There are two types of deep ocean sediments, abyssal clay and biogenous oozes. Abyssal clays are fine-grained sediment, while biogenous ooze is composed of the hard parts of microscopic organisms.
By burring into the bottom sediments
Layers of sediment forming at the bottom of the ocean are called "marine sediments." These sediments are made up of a variety of materials such as mineral particles, organic matter, and remains of marine organisms, which accumulate over time to form distinct layers.
Benthos is a term for bottom-dwelling (i.e. on, in, or very near) organisms because they live on the seabed (what is known as the "benthic zone"). There are different classifications though: the epifauna live on the sea bottom and infauna live in the sediments on the sea bottom.
No, plankton are microscopic plants and animals. They either make their own food from sunlight or eat other microscopic organisms.
In disturbed sediments without layers, the relative age of the sediments would be unknown.
over a very long time layers of these sediments hardened into a sedimentary rock called limestone
They sink to the bottom.
Sediments
sediments
accumulated sediments on the bottom of the river
The oldest layers of sediments are typically found at the bottom of a sedimentary rock sequence, with the youngest layers at the top. Over time, new layers of sediments accumulate on top of older layers, creating a chronological sequence with the oldest layers at the bottom.