The Earth’s interior is commonly classified into three primary layers: the crust, the mantle, and the core. The crust is the outermost layer of the Earth’s interior. The hard, brittle crust stretches from the Earth’s surface to the so-called Mohorovicic discontinuity, also known as the Moho, which is located deep within the planet.
Which of the Earth’s compositionally different strata is liquid?
The earth’s core consists of two components: the liquid outer core and the solid inner core. The outer core is composed of nickel, iron, and magma. Here, temperatures can exceed 50,000 degrees Celsius.
What are the three separate layers of the Earth, according to this quizlet?
The compositionally different layers of the Earth are the crust, mantle, and core.
Andrija Mohorovii, a Croatian seismologist, is credited with finding and characterizing the Moho. In 1909, while analyzing data from a minor earthquake in Zagreb, he noticed two separate sets of P-waves and S-waves emanating from the earthquake’s epicenter.
- Mohorovii was aware that earthquake-caused waves move at speeds proportional to the density of the transporting material.
- In light of this knowledge, he reasoned that the second set of waves could only be created by a sudden shift in density in the Earth’s crust, which could account for such a drastic change in wave velocity.
Using earthquake velocity data, he calculated the Moho depth to be roughly 54 kilometers, which was verified by subsequent seismological research. Since well over a century ago, the Moho has played a significant role in the realms of geology and earth science.
Scientists were able to postulate about the earth’s composition by analyzing the Moho’s refractive nature and how it impacts the speed of P-waves. These early research paved the way for contemporary seismology. Project Mohole was an attempt in the early 1960s to drill to the Moho from deep-ocean locations.
After initial success in establishing deep-ocean drilling, the project was discontinued in 1966 due to political and scientific opposition, poor management, and cost overruns.
Is mantle solid or liquid?
Is the mantle of the Earth composed of liquid magma? – The crust-supporting mantle of the Earth is not composed of molten magma. It does not even consist of magma. The majority of the mantle is composed of solid rock. Expressions such as “a subducted tectonic plate descends into the mantle” and “continental drift” that implicitly allude to the liquid element contribute to the misperception of a liquid mantle.