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Earth’s Outer Core is liquid because it has a different chemical composition from Earth’s solid Inner Core.

Here's a step-by-step explanation:

1. The Earth is composed of several layers: the crust, the mantle, the outer core, and the inner core. Each of these layers has a different composition and state (solid, liquid, or gas).

2. The inner core is solid and is primarily composed of iron and nickel under immense pressure. Despite the high temperatures that exist in the core, these metals remain in a solid state due to this extreme pressure.

3. The outer core, which surrounds the inner core, is in a liquid state. It is also primarily composed of iron and nickel, but it also contains lighter elements such as oxygen, sulfur, and silicon.

4. The presence of these lighter elements lowers the melting point of the outer core material, allowing it to exist in a liquid state despite the high pressures.

5. Therefore, it's the different chemical composition of the outer core compared to the inner core that causes it to be liquid.