Answer the following question given this paragraph: 

The dense, iron core forms the center of the Earth. Scientists know that the core is metal. The inner core is solid, and the outer core is molten. Here are some of the reasons they know this:.


Q: Which layer of the earth is molten?

 Choices:

- the inner core

- the metallic core

- the mantle

- the outer core

A:
the outer core
