Why Does Metal Rust? | A2 ESL Science Reading Passage

Use this A2-B1 ESL science reading passage to learn why metal rusts. It includes key vocabulary, reading comprehension questions, and answers for English learners.

Rust forms when iron or steel reacts with water and oxygen.

Reading Level

A2-B1

Word Count

197 words

Reading Passage

Rust is the reddish-brown material that can appear on some metal objects. You may see rust on old bikes, gates, tools, or nails.

Not every metal rusts in the same way. Rust usually forms on iron or steel. Steel contains iron, so it can rust too. Rust begins when iron meets oxygen and water.

When water stays on iron, oxygen from the air can react with the metal. This reaction slowly changes the iron into rust. Rust is a chemical change. The metal is not just dirty. Part of it has changed into a different material.

Rust can make metal weaker over time. A rusty nail may break more easily. A rusty bike chain may not move smoothly. This is why people try to protect metal objects.

Rust can happen faster in wet places. It can also happen faster near salty water, such as near the ocean. Salt helps water carry the reaction more easily.

Paint can protect metal by covering its surface. Oil can also keep water away. Keeping tools dry is another simple way to slow rust.

Rust is common, but it teaches an important science idea. Air, water, and metal can work together to make a new substance.

Water and oxygen can change iron into rust.

Key Vocabulary

Word	Meaning	Example
metal	a hard material such as iron, steel, or aluminum	The gate is made of metal.
rust	reddish-brown material that forms on iron or steel	Rust appeared on the old bike.
oxygen	a gas in the air	Oxygen helps rust form.
chemical change	a change that makes a new substance	Rust is a chemical change.
protect	to keep something safe from damage	Paint can protect metal from rust.

Reading Comprehension Questions

1. What color is rust?
2. What metals usually form rust?
3. What two things help rust form?
4. Why is rust a chemical change?
5. How can people slow rust?

Answers

1. Rust is reddish-brown.
2. Rust usually forms on iron or steel.
3. Water and oxygen help rust form.
4. It is a chemical change because it makes a new substance.
5. People can slow rust with paint, oil, or by keeping metal dry.

Short Summary

Metal rusts when iron or steel reacts with oxygen and water, making a reddish-brown new substance.

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