Los elementos: el hierro

Iron is the fourth most abundant element in Earth's crust and is essential for life. It forms red iron oxide or rust in the presence of oxygen. Iron is crucial in living organisms, particularly in blood, where it helps transport oxygen. Mars gets its red color from iron oxides, and meteorites are a source of metallic iron. Iron is widely used in industry, especially in steel production, which is much harder than pure iron. All iron on Earth was created in stars.

Which element is more abundant in the Earth's crust than iron?

• Carbon

• Nitrogen

• Oxygen

• Hydrogen

What compound is responsible for the red color of blood?

• Carotene

• Hemoglobin

• Chlorophyll

• Myoglobin

Why is Mars referred to as the Red Planet?

• Its surface is covered with iron oxides.

• It has a lot of volcanoes.

• It is closer to the sun.

• It has a high temperature.

What is formed when carbon is added to iron?

• Bronze

• Steel

• Copper

• Aluminum

Where was all the iron on Earth originally created?

• In the Earth's core

• In the ocean

• In the stars

• In the atmosphere