What is gutenberg discontinuity
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Gutenberg Discontinuity. ... This distinct boundary between the core and the mantle, which was discovered by the change in seismic waves at this depth, is often referred to as the core-mantle boundary, or the CMB. It is a narrow, uneven zone, and contains undulations that may be up to 3 to 5 mi (5-8 km) wide.
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very easy and simple in one line answer
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marks the layer between the lower mantle and the outer core
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