Iron

Iron is a strong metal.

It is very common on Earth. It makes up much of the Earth's core.

Iron is also inside you. It is in your blood. This helps your body carry air.

Sometimes, iron changes. It can react with water and air. This makes brown rust.

Rust can flake off. This shows more metal to the air.

People use iron to make many things. They make tools and steel. Iron is a very important metal.

Iron is a very common metal. It is the most common element on Earth by mass.

Much of the Earth's inner and outer core is made of iron. This metal also helps create the Earth's magnetic field.

Iron is important for your body, too. An adult human has about 4 grams of iron. It lives in proteins like hemoglobin.

These proteins help your blood carry oxygen. They also help your muscles store oxygen. You must eat iron to keep these levels healthy.

Pure iron looks like a silvery-gray mirror. But iron can change when it meets water and oxygen. This change makes rust.

Rust is brown or black. Unlike some other metals, rust flakes off. This lets the air touch even more fresh metal. This way, the metal keeps to corrode.

People use iron to make many things. They mix it to make steel. Steel is used in many big industries because it is cheap and strong.

Iron is a very important metal found all over our world. It is a chemical element with the symbol Fe and the atomic number 26. By mass, it is the most common element on our planet. Much of Earth's inner and outer core is made of iron.

This huge amount of metal helps create the magnetic field of the Earth. It is also the fourth most common element in the Earth's crust. Without iron, our planet would look and act very differently.

When iron meets water and oxygen, a thing that happens is called oxidation. This process creates brown or black substances called hydrated iron oxides, which we call rust.

Rust is different from the layers on some other metals. When rust forms, it takes up more space than the original metal. Because it is bulky, the rust flakes off the surface. This exposes fresh metal to the air so the metal can keep to corrode. Pure iron surfaces look like a smooth, silvery-gray mirror before they rust.

Humans learned to use this metal a long time ago. People in Eurasia started to master working with iron during the 2nd millennium BC. Around 1200 BC, iron tools and weapons began to replace older tools made of copper alloys. This big change is known as the move from the Bronze Age to the Iron Age. Today, we use iron to make many different alloys. These are mixtures of metals like steel and stainless steel. These metals are very common in industry because they are strong and have a low cost.

Iron is also a vital part of how living things work. An adult human body contains about 4 grams of iron.

Most of this iron lives in two important proteins called hemoglobin and myoglobin. Hemoglobin helps your blood carry oxygen through your body. Myoglobin helps your muscles store that oxygen for use. Because your body needs these proteins, you must get enough iron from the food you eat. This is part of how your body manages its iron metabolism.

In space, iron is a very common and special element. It is the sixth most abundant element in the entire universe.

Huge stars create iron during their lives through a process called fusion. When these massive stars explode as supernovae, they scatter iron into space. This iron eventually becomes part of new planets and asteroids. Even the cores of other planets, like Mars or the Moon, are believed to be made mostly of iron. It is truly a building block of the cosmos.

{ "text": "Iron is a fundamental chemical element with the symbol Fe and atomic number 26. It is a transition metal located in group 8 of the periodic table. On our planet, iron is the most common element by mass. Much of the Earth's mass is concentrated in the outer and inner core, which are composed largely of iron.

It is also the fourth most abundant element in the Earth's crust. Because of its strength and low cost, iron is the foundation of modern industry.

\n\nIn its pure metallic state, iron has a smooth, silvery-gray surface that can look like a mirror. However, iron is highly reactive when it meets oxygen and water. This reaction produces hydrated iron oxides, which we commonly call rust.

Unlike the protective layers that form on some other metals, rust is quite destructive. Rust occupies more volume than the original metal it replaces. As a result, the rust flakes off the surface. This flaking process exposes fresh metal underneath, allowing corrosion to continue deeper into the material.\n\n