Question

Dust and shells and fish poop and all sorts of things fall to the sea bed to make sediment. Across broad central regions of the ocean, the sediment accumulates at a uniform rate—piling up about as rapidly here as it does over there. And, in most places, the currents don’t move the sediment around much, so that it stays where it falls. Thus, the thickness of the sediment is related to the age of the rocks beneath the sediment. If you go around an ocean and measure the thickness of the sediment in lots of places, you are likely to find:

Answer 1

The thickness of sediment in the ocean is related to the age of the rocks beneath it. It accumulates uniformly across broad central regions and stays where it falls. Measuring sediment thickness can provide clues about the geology and age of rocks.

Step-by-step explanation:

The thickness of sediment in the ocean is related to the age of the rocks beneath it. Sediment accumulates at a uniform rate across broad central regions of the ocean, and currents don't move the sediment around much. This means that the sediment stays where it falls, allowing it to build up over time.

If you measure the thickness of sediment in lots of places around the ocean, you are likely to find that it varies depending on the age of the rocks beneath it. Older rocks will have thicker sediment layers, while younger rocks will have thinner layers.

Overall, the thickness of sediment can provide clues about the geological history and age of the rocks in a particular area.

Answer 2

The sediment is thin near spreading ridges, and thicker away from the ridges.

Step-by-step explanation:

Marine sediments are insoluble particles of rocks, soils, volcanoes, chemical and organic bodies that are carried from land to the ocean through streams and lakes. The particles are usually of different sizes, which are found either on the shores of the oceans or on the seabed in the form of small rocks and gravel. As stated in the question, in most places currents do not move the sediment very much so that it remains where it falls. However due to the constant movement of the current near the ridges, the sediments are constantly dragged, leaving a thin layer of sediment in this region. On the other hand, the sediment layer is thicker in the ridges region, because the current movement is less constant.