Answer: d. Felsic from bottom to top
Explanation:
Most of the known volcanoes are Stratovolcanoes. They are also called Composite volcanoes because they are structured from layers of materials such as lava, ash and tephra that came out during their eruption with each eruption adding more layers than the last.
The lava that flows from a Stratovolcano is usually made up of Felsic along with lesser amounts of silica and mafic. As a result, most of the rocks that make up such volcanoes are Felsic.
Human
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Around the world, the cities with the dirtiest air and water are typically found in Low-income countries in Africa and Asia.
<h3>Why dirty environment?</h3>
Reason most low income countries espcially Africa and Asia are dirty is largely due to poverty. This is the bane of under deveolpment in these regions.
Most low income countries are poor hence lack basic social amenities to take care of their environment.
Hence, around the world, the cities with the dirtiest air and water are typically found in Low-income countries in Africa and Asia.
Learn more about environements here : brainly.com/question/18827802
