A celestial object takes six to seven years to revolve once around the Sun. It’s made mostly of ice, some of which vaporizes when it passes near the Sun. What is this object?

Why is earth's outer core hotter than earth’s oceanic crust? earth’s oceanic crust is denser than earth’s outer core is. earth’s oceanic crust has lava flowing from the mantle. earth’s outer core has a composition of solid iron and nickel. earth’s outer core is deeper within earth than oceanic crust is.