The correct answer is - a. deposition.
The deltas are formed at the mouths of the rivers right before they enter a large water body, like ocean, sea, or lake. The rivers carry lot of material with them, and they do not have any problem carrying it while they are moving faster, but when they are slowing down significantly, they lose the force required to carry the material, so the material starts to deposit on the river banks. As the material deposits, it makes it hard for all of the river's water to pass through its river bed that is becoming partially blocked, so the river starts to branch out, and seen from above it takes a triangular shape if the peripheries are outlined, or as a tree that is branching out.
Australian rulers didnt know what to do with all the land and gave less reasons to do so over the years
The open ocean is more productive in the polar zones than in the equator due to less disturbance to the organisms.
<h3>Why is the open ocean more productive in the polar zones than in the equator?</h3>
In the open seas, heavy winds and deep waters lead to a high turnover in the water column that prevents photosynthetic microorganisms from converting sunlight into energy while on the other hand, there is less disturbance on the polar zones which leads to higher productivity.
So we can conclude that the open ocean is more productive in the polar zones than in the equator due to less disturbance to the organisms.
Learn more about equator here: brainly.com/question/16876469
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The best and most correct answer among the choices provided by the question is the first choice "demographers"
Demography<span> is the science of populations.</span>Demographers<span> seek to understand population dynamics by investigating three main demographic processes: birth, migration, and aging (including death).</span>
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