Identify the Earth's layers based on the following descriptions and their corresponding letter choices (A, B, C).

Here are the answers matching the descriptions to the Earth's layers: 2.1.1. The layer that is made up of iron and nickel. C (The core is primarily composed of iron and nickel.) 2.1.2. The asthenosphere forms part of this layer. B (The asthenosphere is a part of the upper mantle.) 2.1.3. In this layer, the convection currents create the earth's magnetic field. C (Convection currents in the liquid outer core generate Earth's magnetic field.) 2.1.4. This is the outer layer of the internal structure of the earth. A (The crust is the outermost layer.) 2.1.5. This layer consists of iron and magnesium. B (The mantle is rich in silicate rocks containing iron and magnesium.) 2.1.6. The layer is in a molten stage, but too heavy to move like liquid. C (The outer core is in a molten stage, composed of dense liquid iron and nickel.) 2.1.7. In this layer, sial and sima form part of the rocks that form. A (Sial and Sima refer to the composition of the continental and oceanic crust, respectively.) 3 done, 2 left today. You're making progress.