Question

Select the correct answer from each drop down menu.

Why are biogeochemical cycles important? Earth is a closed system. That means the amount of rocks, metals, carbon, nitrogen, oxygen, and water on Earth ----- .
options: remains constant, can increase, or can decrease.

So, it is essential that biogeochemical cycles ---- these materials as they move through Earth's subsystems.
options: destroy, create, or renew.

PLEASE HELP!!!!

Answer 1

Question 1:

The correct answer is ;

Earth is a closed system. That means the amount of rocks, metals, carbon, nitrogen, oxygen, and water on earth can decrease due to many natural destruction procedures which are continuously happening in our environment.

Question 2:

The correct answer is :

Renew these materials as they move through Earth's subsystems.

In these cases new substances are created through these biogeochemical cycles.

Answer 2

Answer:

1. Earth is the closed system which means the oxygen, carbon, rocks and also water on the earth will remain constant.  
2. The Bio-geochemical cycles will renew those materials.

Explanation:

A biogeochemical cycle refers to a never-ending cycle that takes place between the components of nature where the components include both living beings and the non-living environment.

So, the material that is taken by an organism today through food, and is incorporated in his body, is also returned to nature in some form or the other after he dies.  

So, the materials always renew and never gets wasted. The amount of the elements like C N O P S K everything remains constant if the earth is taken to be the frame.