14 results for “iron”
Planet Earth
Inside the Earth
iron. Diamonds form here, at depths of 150 kilometres and more, and are carried up in rare
Article · 4 min read
Space & the Universe
The Life of a Star
iron. Each stage burns faster than the last. The silicon stage lasts about a day. Iron
Article · 3 min read
Matter, Energy & Physics
The Periodic Table
iron, copper, gold, silver, platinum, chromium, nickel, with their strength, conductivity and shine. Two rows usually
Article · 4 min read
The Human Body
The Heart and Blood
iron-containing protein that grabs oxygen in the lungs and releases it in the tissues; it is the iron
Article · 4 min read
Matter, Energy & Physics
Electricity and Magnetism
iron in its core, and a compass needle is a small magnet lining up with it. In 1820 the Danish
Article · 4 min read
Planets & the Solar System
The Moon
iron and almost no water. The best explanation is dramatic. About 4.5 billion years ago, when
Article · 4 min read
Animals
Animal Migration
iron-containing cells, and can read both its direction and its strength, which varies with latitude
Article · 4 min read
Space & the Universe
Nebulae
iron and heavier elements, to the clouds between the stars. Those clouds collapse to form new stars
Article · 3 min read
Planet Earth
Rocks, Minerals and Fossils
iron, magnesium, calcium, sodium and potassium. Feldspar and quartz alone make up more than half the crust
Article · 4 min read
Animals
The Octopus
iron-based one that makes ours red. It breathes water through gills inside its body and can also
Article · 3 min read
Planets & the Solar System
Mars
Iron minerals in the soil have oxidised over billions of years, coating the planet in fine
Article · 4 min read
Matter, Energy & Physics
Atoms
iron; 79, gold; 92, uranium. There are 94 naturally occurring elements and about two dozen more
Article · 4 min read
Space & the Universe
Exoplanets: Worlds Around Other Stars
iron. Nobody expected such things; giant planets are supposed to form far out where it is cold
Article · 3 min read
Planets & the Solar System
Mercury and Venus
iron core takes up about 85 percent of its radius, suggesting a giant collision early in its history
Article · 3 min read
