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
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Answer:
Axis
Explanation: The y axis is the horizontal line used in graphs and the y axis is the vertical line used in graphs
