Question

choose two facts about the earths magnetic field. the field exists because of the spinning of iron metal in the core. the field is created by electricity passing through the crust. the field shields the earth from charged particles sent out by the sun. the field generates electricity in the atmosphere that causes lightning.

Explanation:

• The Earth's magnetic field exists due to the dynamo effect in the outer core where liquid iron - nickel alloy is in motion (spinning).
• The Earth's magnetic field acts as a shield. Charged particles from the solar wind (sent out by the Sun) are deflected by the magnetic field. If they were not deflected, they could strip away the Earth's atmosphere.

• The Earth's crust is not involved in creating the magnetic field in the way described in the second option. The magnetic field is generated in the core, not by electricity passing through the crust.
• Lightning is caused by the separation of charges within clouds (and between clouds and the ground) due to atmospheric processes like convection, friction, etc., not by the Earth's magnetic field generating electricity in the atmosphere.

Answer:

• The field exists because of the spinning of iron metal in the core.
• The field shields the earth from charged particles sent out by the sun.