Misc
Visualizing the Abundance of Elements in the Earth’s Crust
Visualizing the Abundance of Elements in the Earth’s Crust
Elements in the Earth’s crust provide all the basic building blocks for mankind.
But even though the crust is the source of everything we find, mine, refine, and build, it really is just scratching the surface of our planet.
After all, the innermost layer of the Earth, the core, represents 15% of the planet’s volume, whereas the mantle occupies 84%. Representing the remaining 1% is the crust, a thin layer that ranges in depth from approximately 5-70 km (~3-44 miles).
This infographic takes a look at what elements make up this 1%, based on data from WorldAtlas.
Earth’s Crust Elements
The crust is a rigid surface containing both the oceans and landmasses. Most elements are found in only trace amounts within the Earth’s crust, but several are abundant.
The Earth’s crust comprises about 95% igneous and metamorphic rocks, 4% shale, 0.75% sandstone, and 0.25% limestone.
Oxygen, silicon, aluminum, and iron account for 88.1% of the mass of the Earth’s crust, while another 90 elements make up the remaining 11.9%.
Rank | Element | % of Earth's Crust |
---|---|---|
1 | Oxygen (O) | 46.1% |
2 | Silicon (Si) | 28.2% |
3 | Aluminum (Al) | 8.2% |
4 | Iron (Fe) | 5.6% |
5 | Calcium (Ca) | 4.1% |
6 | Sodium (Na) | 2.3% |
7 | Magnesium (Mg) | 2.3% |
8 | Potassium (K) | 2.0% |
9 | Titanium (Ti) | 0.5% |
10 | Hydrogen (H) | 0.1% |
Other elements | 0.5% | |
Total | 100.0% |
While gold, silver, copper and other base and precious metals are among the most sought after elements, together they make up less than 0.03% of the Earth’s crust by mass.
#1: Oxygen
Oxygen is by far the most abundant element in the Earth’s crust, making up 46% of mass—coming up just short of half of the total.
Oxygen is a highly reactive element that combines with other elements, forming oxides. Some examples of common oxides are minerals such as granite and quartz (oxides of silicon), rust (oxides of iron), and limestone (oxide of calcium and carbon).
#2: Silicon
More than 90% of the Earth’s crust is composed of silicate minerals, making silicon the second most abundant element in the Earth’s crust.
Silicon links up with oxygen to form the most common minerals on Earth. For example, in most places, sand primarily consists of silica (silicon dioxide) usually in the form of quartz. Silicon is an essential semiconductor, used in manufacturing electronics and computer chips.
#3: Aluminum
Aluminum is the third most common element in the Earth’s crust.
Because of its strong affinity for oxygen, aluminum is rarely found in its elemental state. Aluminum oxide (Al2O3), aluminum hydroxide (Al(OH)3) and potassium aluminum sulphate (KAl(SO4)2) are common aluminum compounds.
Aluminum and aluminum alloys have a variety of uses, from kitchen foil to rocket manufacturing.
#4: Iron
The fourth most common element in the Earth’s crust is iron, accounting for over 5% of the mass of the Earth’s crust.
Iron is obtained chiefly from the minerals hematite and magnetite. Of all the metals we mine, over 90% is iron, mainly to make steel, an alloy of carbon and iron. Iron is also an essential nutrient in the human body.
#5: Calcium
Calcium makes up about 4.2% of the planet’s crust by weight.
In its pure elemental state, calcium is a soft, silvery-white alkaline earth metal. It is never found in its isolated state in nature but exists instead in compounds. Calcium compounds can be found in a variety of minerals, including limestone (calcium carbonate), gypsum (calcium sulphate) and fluorite (calcium fluoride).
Calcium compounds are widely used in the food and pharmaceutical industries for supplementation. They are also used as bleaches in the paper industry, as components in cement and electrical insulators, and in manufacturing soaps.
Digging the Earth’s Crust
Despite Jules Verne’s novel, no one has ever journeyed to the center of Earth.
In fact, the deepest hole ever dug by humanity reaches approximately 12 km (7.5 miles) below the Earth’s surface, about one-third of the way to the Earth’s mantle. This incredible depth took about 20 years to reach.
Although mankind is constantly making new discoveries and reaching for the stars, there is still a lot to explore about the Earth we stand on.
Misc
The State of Copper Recycling in the U.S.
This graphic explores how recycling copper can help address the demand for the metal in the U.S.
The State of Copper Recycling in the U.S.
Copper is essential for a low-carbon economy due to its crucial role in renewable energy technologies.
As a result, many worry that a lack of the metal used in wires and batteries can hurt a transition to a green economy.
In this graphic, our sponsor, the Copper Development Association, explores how recycling can address the demand for copper.
Copper Scrap Recycled in the U.S.
In 2022, the total copper scrap recycled in the U.S. was approximately 830,000 tonnes, equivalent to 32% of the total U.S. copper supply for the same period. Around 670,000 tonnes (81%) originated from pre-consumer sources generated during manufacturing operations, while 160,000 tonnes (19%) came from post-consumer sources, such as obsolete products.
Brass and wire-rod mills accounted for the majority of the copper recycled from scrap (85%). Additionally, smelters, refiners, and ingot makers make 10% and chemical plants, foundries, and other manufacturers around 5%.
Copper from Scrap | 2022 Content (tonnes) |
---|---|
Brass and wire-rod mills | 650,000 t |
Smelters and refiners | 40,000 t |
Ingot makers | 39,500 t |
Foundries, Other | 40,000 t |
Despite the rising demand for copper, the U.S. predominantly exports its copper scrap.
In 2022, the U.S. exported half of the 1,569,000 tonnes of the copper content generated from scrap. This export trend persisted because, until recent years, the country lacked operating secondary copper smelters capable of processing complex scrap grades into furnace-ready raw materials.
However, reshoring this metal presents an opportunity for the country.
Tapping into the Urban Mine
North America currently has about 86 million tonnes (Mt) of copper in use, known as the Urban Mine. This copper will become available for recycling as aging infrastructure and products reach the end of their service lives:
- Buildings: 45.4 Mt
- Infrastructure: 16.1 Mt
- Consumer Products: 11.2 Mt
- Transport: 8.5 Mt
- Industrial Uses: 4.8 Mt
Increased secondary smelting and refining capacity is a crucial building block for a more resilient and self-sufficient U.S. copper supply chain.
In response to the growing need for copper, the U.S. plans to add over 280,000 tonnes of secondary smelting and refining capacity in the next few years. This expansion will enable the country to process more complex scrap grades domestically.
Given that copper products can last for decades, creating a lag time before the material becomes available for recycling, primary production will continue to play an important role in meeting the increasing needs in the U.S.
The Copper Development Association (CDA) brings the value of copper and its alloys to society to address the challenges of today and tomorrow. Visit www.copper.org to learn more about why copper is a critical mineral.
Misc
Why Copper Is Critical for Data Centers
Copper consumption for data centers in North America is estimated to jump from 197,000 tonnes in 2020 to 238,000 tonnes in 2030.
Why Copper Is Critical for Data Centers
Data centers are computer server hubs that collect, store, and process large amounts of data, requiring extensive network infrastructure and electric power supply.
As the North American data center market grows, copper will be a key building block in this infrastructure.
This infographic from the Copper Development Association illustrates the critical role of copper in data center development.
Copper in Technology
Much has been said about the growing demand for critical minerals like copper, nickel, and lithium for clean technologies such as batteries, EVs, solar, and wind power.
Copper, however, has a more extensive role in technology as it is used in wires that connect power grids and data centers around the planet.
As one of the best conductors of electricity, copper maximizes efficiency in the transmission and distribution of electricity. Its thermal conductivity also helps build efficient heat exchangers, which are vital for cooling in data centers.
The inherent ductility and malleability of copper make it ideal for shaping into compact system components, like electrical connectors. In addition, copper can be fully recycled without losing any beneficial properties, providing an excellent solution in a growing green economy.
Data centers use copper across various electrical applications, including:
- Power cables
- Busbars
- Electrical connectors
- Heat exchangers and sinks
- Power distribution strips
To put the demand into perspective, Microsoft’s $500 million data center in Chicago required 2,177 tonnes of copper for construction.
North America’s Growing Need for Copper
With the rise of cloud computing and the Internet of Things (IoT), the North American data center market is expanding.
North American data center infrastructure is expected to grow from a $33 billion business in 2020 to $70 billion in 2030 and $185 billion in 2040.
This, in turn, will amplify the demand for copper. Copper consumption for data centers is estimated to jump from 197,000 tonnes in 2020 to 238,000 tonnes in 2030 and 293,000 tonnes in 2040.
The Copper Development Association (CDA) brings the value of copper and its alloys to society to address the challenges of today and tomorrow. Visit www.copper.org to learn more about copper’s critical role in data centers.
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