Is the Moho solid or liquid?
The “Moho”, as it is often called for brevity, is the boundary between the crust and the mantle. While the mantle has liquid further down, it’s solid at the top just like the crust — but with a different mineral composition.
How would you describe Mohorovicic Discontinuity?
What is the Mohorovičić Discontinuity? The Mohorovicic Discontinuity, or “Moho,” is the boundary between the crust and the mantle. The red line in the diagram shows its location. In geology the word “discontinuity” is used for a surface at which seismic waves change velocity.
How deep was the deepest well drilled trying to reach the Moho?
The first attempt to drill to the Moho was in 1961, off the coast of Mexico near Guadalupe, as part of Project Mohole. The deepest hole from that effort penetrated 183 m (601 ft) into the sea floor, the upper 179 m (557 ft) of which consisted of sediments.
Where is the Mohorovicic Discontinuity located?
Only beneath mid-ocean ridges does it define the lithosphere–asthenosphere boundary. The Mohorovičić discontinuity is 5 to 10 kilometres (3–6 mi) below the ocean floor, and 20 to 90 kilometres (10–60 mi) beneath typical continental crusts, with an average of 35 kilometres (22 mi).
What is the approximate temperature of the mantle outer core boundary?
The temperature of the mantle varies greatly, from 1000° Celsius (1832° Fahrenheit) near its boundary with the crust, to 3700° Celsius (6692° Fahrenheit) near its boundary with the core. In the mantle, heat and pressure generally increase with depth.
Which of the following is the hottest and the densest layer of Earth?
The core is the hottest, densest part of the Earth. Although the inner core is mostly NiFe, the iron catastrophe also drove heavy siderophile elements to the center of the Earth.
What is a characteristic of the Moho?
The Moho is the boundary between the crust and the mantle in the earth. This is a depth where seismic waves change velocity and there is also a change in chemical composition. Also termed the Mohorovicic’ discontinuity after the Croatian seismologist Andrija Mohorovicic’ (1857-1936) who discovered it.
What was found in the deepest hole on Earth?
The 23-centimetre (9 in) diameter boreholes were drilled by branching from a central hole. The deepest reached 12,262 metres (40,230 ft) in 1989, the deepest artificial point on Earth. In terms of true vertical depth, it is the deepest borehole in the world….Kola Superdeep Borehole.
| Location | |
|---|---|
| Closed | 1995 |
What was found in the Kola Superdeep Borehole?
The Earth has gas. Unexpectedly, helium, hydrogen, nitrogen, and even carbon dioxide (from microbes) were found all along the borehole. There is no basalt under the continent’s granite. This was a huge surprise. Seismic suggested that at 9,000 metres the granite would give way to basalt.
What is the Moho made of?
According to the theory, the water reacts with rocks in the mantle known as peridotite, chemically altering them to form a thick layer of a less dense mineral called serpentine. Hess called the Moho an “alteration front”—a boundary where mantle rock was altered to become serpentines.
What is the temperature of the crust?
Near the Moho, the temperature of the crust ranges from 200° Celsius (392° Fahrenheit) to 400° Celsius (752° Fahrenheit). Crafting the Crust Billions of years ago, the planetary blob that would become the Earth started out as a hot, viscous ball of rock.
What is the approximate temperature at the boundary between the asthenosphere and the stiffer mantle?
A) 3500°C and 0.4 million atmospheres Which combination of temperature and pressure is inferred to occur within Earth’s stiffer mantle?
What is the Mohorovičić discontinuity?
The Mohorovičić discontinuity, also known simply as just the Moho lies between the crust and the mantle of the earth. The Mohorovicic is in between the Earth’s crust and mantle.
How far below the surface is the Andrija Mohorovicic discontinuity?
This boundary is located approximately 24 miles below the earth’s surface and 6 miles below the oceanic floor, a distance which varies from place to place. The discontinuity was named after Croatian seismologist and geophysicist Andrija Mohorovicic who pioneered its discovery in 1909 and explained…
What is the velocity of the Moho discontinuity?
It lies below the basalt rock system and above the dunites rock systems. Across the Moho discontinuity, seismic waves change their velocity abruptly from between 4 miles per second to 4.5 miles per second in the lower part of the crust to between 4.8 miles to 5.4 miles per second in the upper part of the mantle.
Where is the Mohorovicic?
The Mohorovicic is in between the Earth’s crust and mantle. What is the Mohorovicic Discontinuity? The Mohorovicic discontinuity (the Moho) is the boundary lying between the crust and the mantle of the earth across which seismic waves change velocities.