3) is the correct answer.
The Earth's crust is its lightest, most buoyant rock layer.
The Earth’s mantle is the mostly-solid bulk of Earth's interior.
The asthenosphere is the highly viscous, mechanically weak, and ductile region of the upper mantle of Earth.
The outer core is the third layer of the Earth.
Earth's inner core is the innermost geologic layer of the planet Earth.
B. Thou and know is a slant rhyme
Well a public essay is something for everyone to know really and a personal essay is something about you personally that no one should really know .
