Answer:
Deforestation
Explanation:
Sub-Saharan Africa simply refers to the southern part of the African continent which covers many of the countries. It covers a large geographical area. The area faces a lot of environmental problems that mostly includes the pollution such as water, soil, air, mining activities also affects the area, deforestation, and climate change.
From the above give options, deforestation is the major environmental problem in the Sub-Saharan Africa.
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The average space between molecules is about 30 angstroms or 3 nm.
Explanation:
Atomic spacing refers to the distance between the nuclei of an atoms in a material.This space is large compared to the size of atomic nucleus and is related to the chemical bonds which binds together.
The Atomic spacing is defined by using laws of diffraction and by passing electromagnetic waves called frequency through the material.
Gas is a state of matter that has no fixed shape and no volume.
