Question

different kinds of metals have different jobs. for example, the iron inside your bicycle is very strong and helps hold it together, while the copper inside your electronic devices is amazing at carrying electricity to make them work. because metals are so good at conducting heat and electricity, and because they are so strong and easy to shape, they are the backbone of much of our modern world. from the simple fork you eat with to the complex engine that powers an airplane, metals are working hard! when we finish using a metal object, it can often be melted down and used again—we call this recycling (give old metals a superhero second life!)—which helps us save earth’s resources. 1. highlight/ underline main ideas (the most important sentences)

Explanation:

The main ideas are key summary sentences about metals' roles, properties, and recycling.

Answer:

Different kinds of metals have different jobs.
Because metals are so good at conducting heat and electricity, and because they are so strong and easy to shape, they are the backbone of much of our modern world.
When we finish using a metal object, it can be melted down and used again—we call this recycling (Give old metals a superhero second life!)—which helps us save Earth's resources.