Question

1. what is the primary composition of the outer core? liquid silicate minerals solid iron and nickel solid magnesium and silicon liquid iron and nickel

Explanation:

To determine the primary composition of the Earth's outer core, we recall geological knowledge: the outer core is in a liquid state and is primarily composed of iron and nickel. Let's analyze each option:

• "Liquid silicate minerals": Silicate minerals are more associated with the mantle, not the core. Eliminate this.
• "Solid iron and nickel": The inner core is solid iron - nickel, while the outer core is liquid. Eliminate this.
• "Solid magnesium and silicon": These elements are not the primary components of the core. Eliminate this.
• "Liquid iron and nickel": This matches the known composition and state (liquid) of the outer core.

Answer:

D. Liquid iron and nickel