You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "what is the state of matter of the earth's outer core?" whose answer is fluid.
Each document should contain about 30 words, and these documents should contain useful information.

Query: state of matter of the earth's outer core
Useful Output:

Doc 1: The inner core of the Earth is not a normal solid but is composed of a solid iron sublattice and liquid-like light elements, which is also known as a
Doc 2: According to conventional scientific wisdom, Earth's core consists of a liquid outer core surrounding a solid inner core (SN: 1/28/19). But
Doc 3: The main difference is in their states of matter: the outer core is liquid, while the inner core is solid. The inner core is also hotter and
Doc 4: It's the iron atoms that form the 3D "solid" structure in a superionic state, and the lighter elements that flow around it like liquid.
Doc 5: The outer core is liquid. The inner core is solid because it is made of very dense, or heavy, materials - like iron and nickel.