CRUST,MANTLE,CORE

The earth is made up of four primary layers: the inner core, outer core, mantle, and crust.The outer core is more than 800 miles and less than 2,200 miles from the Earth's center. Which of the following inequalities represents all possible distances, d, in miles, from the Earth's center that are in the outer core?

In the year 2011, NASA launched a mission to study the Moon from 'crust to core' through its