- 1 What is the Moho made of?
- 2 Why is the Moho important?
- 3 How was Moho identified?
- 4 What is meant by Moho discontinuity?
- 5 What is above and below the Moho?
- 6 How thick is the Moho layer?
- 7 Is the Moho solid or liquid?
- 8 Are tectonic plates?
- 9 Which layer of Earth almost reaches the center of the Earth?
- 10 What do discontinuities represent in the layers of earth?
- 11 What are P and S wave shadow zones?
- 12 Which is the thickest layer of the earth?
- 13 What is the Moho line?
- 14 What is discontinuity in Earth?
- 15 What are the two layers of lithosphere?
What is the Moho made of?
Oscar L. The Mohorovicic Discontinuity marks a change in the composition of rocks, from basalt in the crust to heavier silicates (peroidotite, dunite) in the mantle.
Why is the Moho important?
The Mohorovićić discontinuity, also known as the Moho, is a discrete jump in seismic wave velocities – a seismic discontinuity – that has come to define the boundary between the crust and the mantle. Its significance stems from its clear demarcation of the first boundary of the chemically differentiated solid Earth.
How was Moho identified?
The Moho is widely believed to be the boundary between Earth’s crust and an underlying layer of denser rocks in Earth’s interior called the mantle. It is named after Croatian seismologist Andrija Mohorovicic, who first detected it in 1909 by examining seismic waves moving through the Earth.
What is meant by Moho discontinuity?
Moho, or Mohorovičić discontinuity, boundary between the Earth’s crust and its mantle. The Moho lies at a depth of about 22 mi (35 km) below continents and about 4.5 mi (7 km) beneath the oceanic crust. Modern instruments have determined that the velocity of seismic waves increases rapidly at this boundary.
What is above and below the Moho?
The surface of the Earth is the top of the ‘crust’ – whether one is under the sea or on land! By and large, the portions of the crust that poke above the sea to form land consist of ‘continental crust’. Below the Moho, the mantle extends to the surface of the Earth’s outer core – about 2890 km down.
How thick is the Moho layer?
How Deep is the Moho? The Mohorovicic Discontinuity marks the lower limit of Earth’s crust. As stated above, it occurs at an average depth of about 8 kilometers beneath the ocean basins and 32 kilometers beneath continental surfaces. Mohorovicic was able to use his discovery to study thickness variations of the crust.
Is the Moho solid or liquid?
Explanation: 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.
Are tectonic plates?
A tectonic plate (also called lithospheric plate) is a massive, irregularly shaped slab of solid rock, generally composed of both continental and oceanic lithosphere. Plate size can vary greatly, from a few hundred to thousands of kilometers across; the Pacific and Antarctic Plates are among the largest.
Which layer of Earth almost reaches the center of the Earth?
Earth’s core is the very hot, very dense center of our planet. The ball-shaped core lies beneath the cool, brittle crust and the mostly-solid mantle. The core is found about 2,900 kilometers (1,802 miles) below Earth’s surface, and has a radius of about 3,485 kilometers (2,165 miles).
What do discontinuities represent in the layers of earth?
According to seismic data, the mantle includes layers where wave velocities are slowly varying functions of depth and relatively thin anomalous zones of pronounced changes in the elastic parameters. The anomalous zones are often called discontinuities.
What are P and S wave shadow zones?
The shadow zone is the area of the earth from angular distances of 104 to 140 degrees from a given earthquake that does not receive any direct P waves. The shadow zone results from S waves being stopped entirely by the liquid core and P waves being bent (refracted) by the liquid core.
Which is the thickest layer of the earth?
The core is the thickest layer of the Earth, and the crust is relatively thin, compared to the other layers.
What is the Moho line?
The Moho is the boundary between the crust and the mantle in the earth. Also termed the Mohorovicic’ discontinuity after the Croatian seismologist Andrija Mohorovicic’ (1857-1936) who discovered it. The boundary is between 25 and 60 km deep beneath the continents and between 5 and 8 km deep beneath the ocean floor.
What is discontinuity in Earth?
Earth’s interior is made of different kinds of materials. Unique layers are there according to their characteristics inside the earth. All those layers are separated from each other through a transition zone. These transition zones are called discontinuities.
What are the two layers of lithosphere?
There are two types of lithosphere: oceanic lithosphere and continental lithosphere.