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.)