Final answer:
The correct order of the Earth's regions from the center outward is core, mantle, then crust.
Step-by-step explanation:
The regions of the Earth, listed in order from the center outward, are the core, the mantle, and the crust. The core is further divided into the inner and outer core, with the inner core being solid and the outer core being liquid, both mainly composed of iron and nickel. Surrounding the core is the mantle, which is made of solid rock that can behave plastically under certain conditions. Encapsulating the mantle is the Earth's crust, the thin outermost layer which includes the continental and oceanic crusts. Therefore, the correct answer to the question is (2) core, mantle, crust.