The layer of the Earth made of melted liquid metal is called the outer core.

Here's a breakdown:

* Earth's Structure: The Earth is composed of several layers: the crust, mantle, outer core, and inner core.

* Outer Core: The outer core is a liquid layer about 2,200 kilometers (1,367 miles) thick. It's primarily composed of iron and nickel, along with small amounts of other elements like sulfur, silicon, and oxygen.

* Molten Metal: The immense pressure and heat within the Earth cause the iron and nickel to melt, creating a liquid layer.

Let me know if you have any other questions about Earth's structure!