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Earth is composed of four main layers, starting with an inner core at the planet's center, enveloped by the outer core, mantle, and crust. The inner core is a solid sphere made of iron and nickel metals about 759 miles (1,221 kilometers) in radius.
source: nasa
C maybe she wanted to keep them safe
It is called a flood plain because it is a big wide space in which allows the water to flow currently.