Most of the 'world's population' resides in the 'temperate climate zone' in the northern hemisphere.
<u>Explanation:</u>
68% of the total worlds land comes in the 'northern hemisphere'. Thus, this hemisphere naturally holds most of the world's population.
The temperate climate zone in this hemisphere, which is characterized by the presence of equal seasons of winter and summer, is home to most of the world's population.
It is because this climate is most favorable for humans to survive and carry out most activities.
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.
