Question

go to this link and watch the video: https://www.youtube.com/watch?v=8pyql9y7vzo \bill nye magnetism part 1 (edited) the url is case - sensitive. then answer these questions: 1. what three minerals are attracted to a magnet? 2. what is it about these minerals that make the earth one big magnet? 3. magnetism is made up of moving electrons. where do these moving electrons come from when making an electromagnet? 4. what is it that makes a magnet different from a piece of iron that is not magnetic?\

Explanation:

Step1: Recall knowledge from magnetism - related physics

In physics, materials attracted to magnets are ferromagnetic.

Step2: Identify ferromagnetic minerals

The three main minerals attracted to a magnet are magnetite, hematite with some degree of magnetization, and pyrrhotite.

Step3: Understand Earth's magnetic - making factors

These minerals contain iron or iron - related compounds. Iron is a ferromagnetic element. In the Earth's core, there is a large amount of iron and nickel in a liquid state. The movement of this molten iron - nickel alloy (convection currents) generates the Earth's magnetic field.

Step4: Determine electron source in electromagnets

In an electromagnet, the moving electrons come from the electric current flowing through the wire wrapped around a core (usually a ferromagnetic material). The battery or power source provides the potential difference that causes the electrons to flow.

Step5: Differentiate magnet and non - magnetic iron

In a magnet, the magnetic domains (regions where the magnetic moments of atoms are aligned) are aligned in a particular direction, creating a net magnetic field. In a non - magnetic piece of iron, the magnetic domains are randomly oriented, so there is no net magnetic field.

Answer:

1. Magnetite, hematite (with some magnetization), pyrrhotite
2. The presence of iron or iron - related compounds. In the Earth's core, the movement of molten iron - nickel alloy (convection currents) generates the magnetic field.
3. From the electric current flowing through the wire of the electromagnet.
4. In a magnet, the magnetic domains are aligned, creating a net magnetic field; in non - magnetic iron, the magnetic domains are randomly oriented.