What is the boundary between the mantle and the crust?

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.

Which of the following is the boundary between the core and the mantle?

CMB
The largest compositional discontinuity within the Earth is the core-mantle boundary (CMB), at a depth of 2889 km. This boundary and the adjacent transition zones in the lowermost mantle and outermost core play a critical role in the Earth’s thermal and chemical evolution.

What is the boundary that separates and divides the lower mantle from the outer core?

Thus, Gutenberg established an accurate boundary line — or discontinuity — that separates and divides the lower mantle from the outer core. The actual discontinuity area is an uneven and narrow zone that contains undulations of up to 3-5 miles wide.

Which boundary separates the crust from core?

Detailed Solution. The correct answer is Moho. The boundary between the crust and the asthenosphere (upper reaches of the mantle) where there is a discontinuity in the seismic velocity forms the Mohorovicic (Moho) discontinuity.

How the boundary between crust and mantle was first discovered?

Croatian seismologist Andrija Mohorovičić is credited with first discovering and defining the Moho. In 1909, he was examining data from a local earthquake in Zagreb when he observed two distinct sets of P-waves and S-waves propagating out from the focus of the earthquake.

What type of plate boundary exists?

There are three kinds of plate tectonic boundaries: divergent, convergent, and transform plate boundaries. This image shows the three main types of plate boundaries: divergent, convergent, and transform. Image courtesy of the U.S. Geological Survey.

Which of the following is the boundary between outer core and core?

The core is made of two layers: the outer core, which borders the mantle, and the inner core. The boundary separating these regions is called the Bullen discontinuity.

What are the boundaries between the layers of the earth?

The boundary between the crust (continental or oceanic) and the underlying mantle is known as the Mohorovičić discontinuity (also called Moho), which is named for its discoverer, Croatian seismologist Andrija Mohorovičić.

What is the temperature at the boundary between the lower mantle and the core?

This estimate can be reconciled with all recent static melting measurements on iron and lays within the uncertainty of shock temperature measurements. The resulting temperature at the core-mantle boundary of about 4000 K then requires a large temperature gradient at the bottom of the lower mantle of about 1500 K.

What is the lower boundary of the crust called?

surrounding the mantle is the crust, whose lower boundary is called the Mohorovičić discontinuity. In normal continental regions the crust is about 30 to 40 km thick; there is usually a superficial low-velocity sedimentary layer underlain by a zone in which seismic velocity increases with depth.

Who discovered the mantle?

In 1909 Andrija Mohorovicic (1857-1936), a Croatian seismologist, helped reveal the existence of the shallowest of these layers, the crust, and the underlying layer, the Earth’s mantle.

What plate boundary forms a trench?

convergent plate boundaries
In particular, ocean trenches are a feature of convergent plate boundaries, where two or more tectonic plates meet. At many convergent plate boundaries, dense lithosphere melts or slides beneath less-dense lithosphere in a process called subduction, creating a trench.

What are the two distinct regions of the upper mantle?

Two parts of the upper mantle are often recognized as distinct region s in Earth’s interior: the lithosphere and the asthenosphere.

What is the difference between the lithospheric crust and the mantle?

Different types of rocks distinguish lithospheric crust and mantle. Lithospheric crust is characterized by gneiss (continental crust) and gabbro (oceanic crust). Below the Moho, the mantle is characterized by peridotite, a rock mostly made up of the minerals olivine and pyroxene.

How does the mantle affect the landscape of the Earth?

The transfer of heat and material in the mantle helps determine the landscape of Earth. Activity in the mantle drives plate tectonics, contributing to volcano es, seafloor spreading, earthquake s, and orogeny (mountain-building).

How does the transfer of heat and material in the mantle?

The transfer of heat and material in the mantle helps determine the landscape of Earth. Activity in the mantle drives plate tectonics, contributing to volcano es, seafloor spreading, earthquake s, and orogeny (mountain-building). The mantle is divided into several layers: the upper mantle, the transition zone,…