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May 8, 2018 · Learn about the three major layers of the Earth: the crust, the mantle, and the core. Each layer has unique properties and is made up of different elements and minerals.
- John Misachi
2 days ago · Earth is the only planet known to harbour life and has a diverse surface of continents, oceans, and atmosphere. Learn about its origin, structure, features, and history from Britannica's experts.
Chemical composition. Earth's mass is approximately 5.97 × 1024 kg (5.970 Yg). It is composed mostly of iron (32.1% by mass), oxygen (30.1%), silicon (15.1%), magnesium (13.9%), sulfur (2.9%), nickel (1.8%), calcium (1.5%), and aluminium (1.4%), with the remaining 1.2% consisting of trace amounts of other elements.
- Namesake. The name Earth is at least 1,000 years old. All of the planets, except for Earth, were named after Greek and Roman gods and goddesses. However, the name Earth is a Germanic word, which simply means “the ground.”
- Potential for Life. Earth has a very hospitable temperature and mix of chemicals that have made life abundant here. Most notably, Earth is unique in that most of our planet is covered in liquid water, since the temperature allows liquid water to exist for extended periods of time.
- Size and Distance. With an equatorial diameter of 7926 miles (12,760 kilometers), Earth is the biggest of the terrestrial planets and the fifth largest planet in our solar system.
- Orbit and Rotation. As Earth orbits the Sun, it completes one rotation every 23.9 hours. It takes 365.25 days to complete one trip around the Sun. That extra quarter of a day presents a challenge to our calendar system, which counts one year as 365 days.
Apr 30, 2023 · Learn about the chemical and mechanical properties of Earth's layers, from the solid iron core to the rocky crust. Find out how heat, pressure, and time shape Earth's interior and affect its magnetic field and diamond formation.
Feb 2, 2023 · The earth’s internal structure is made up of three major layers: the crust, the mantle, and the core, The mantle and the core are further subdivided to form five distinct layers in total.
The Earth has a layered structure made up of crust, mantle, outer core and inner core. Find out more in this BBC Bitesize guide for students aged 11-14.