The Earth is a "closed system" which means that the amount of rocks, carbon, metals, nitrogen, water and oxygen on earth remains constant.
So it is essential that "biogeochemical cycles renew these materials" as they move through the Earth's subsystems.
<u>Explanation</u>:
The Earth's only source of extra-planetary energy is the Solar radiations received by Earth.
The biogeochemical cycles on the planet are responsible for processing the same old rocks, metals, carbon, nitrogen, oxygen, water, and other abiotic substances on Earth in order to naturally renew them and make them available for reuse.
No naturally occurring element on Earth is newly produced. It is only renewed through biogeochemical processes.
The correct answer is letter B. increase deposition of sediments upstream. The negative effect of using too much water for the irrigation of crops is that it wash out sediments and these sediments are brought down the water streams.
Since you did not give options, I will just help you out by saying that Implied Powers are powers that are <em>Not stated directly but are suggested to be true</em>
