The area of square a is 100
The Earth has an outer solid layer called the crust, a highly viscous layer called the mantle, a liquid layer that is the outer part of the core, called the outer core, and a solid center called the inner core. ... The crust is the outermost layer of the Earth. It is made of solid rocks.
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A squatter settlement therefore, can be defined as a residential area which has developed without legal claims to the land and/or permission from the concerned authorities to build; as a result of their illegal or semi-legal status, infrastructure and services are usually inadequate.
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All of them, except for D
Explanation: hope it helps;)
