There is one area in the earth’s crust that is liquid. That is the outer core. The inner core is a solid chunk of iron ore, nickel, and other magnetic metals. Nickel and iron also make up a good portion of the outer core too. The only difference is that they are liquid in the outer core.
This part of the earth is about 1,400 miles thick, or 2,300 kilometers. Often, this is called the “liquid core” of the earth, since the inner core, the absolute center of the earth, is a solid hunk of rock. Some think it is possible there is sulfur and oxygen in the outer core as well, since it’s not under enough pressure to be solid like the inner core.
