Natural ecosystems are able to maintain a vibrant diversity of life because they incorporate intricate recycling systems that conserve essential materials.
Answer: A. Large earthquakes offshore of Portugal.
Explanation:
Large earthquakes in coastal areas can cause tsunamis, an example of which being the boxer day tsunami in 2004.
Hydraulic fracturing using high pressure liquids to break rocks can be used to access deep reservoirs of <u>crude oil. </u>
<h3>What is the use of hydraulic fracturing?</h3>
In a process known as fracking, hydraulic fracturing is done when a fluid is injected into rocks far below the surface.
The aim of this process is to get the rocks to break apart which would then allow the deep reserves of oil to be accessed. This is a major process of crude oil production in the United States.
Find out more on fracking at brainly.com/question/24561007.
Dead zones are hypoxic (low-oxygen) areas in the world's oceans and large lakes, caused by "excessive nutrient pollution from human activities coupled with other factors that deplete the oxygen required to support most marine life in bottom and near-bottom water.
