Consider the following statements 1 Mohorovicic discontinuity separates crust and man...........

Geography Earth Geology

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Consider the following statements :

1. Mohorovicic discontinuity separates crust and mantle while Gutenberg disparity separates mantle and core.

2. The discontinuities are the zones of transition where temperature and density change abruptly.

3. Seismic studies do not give a true picture about the presence and depth of discontinuities.

4. A discontinuity holds geologic significance for carrying rare earth elements.

Which of the statements given above is/are incorrect ?

1, 2 and 4

2 , 3 and 4

3 and 4

1 and 2

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Explanation:

The bottom of the crust (both the oceanic and continental varieties) is determined by a distinct seismic transition zone termed the Mohorovicic discontinuity. The Mohorovicic discontinuity, commonly referred to as "the Moho" or the "M-discontinuity," is the transition or boundary between the bottom of the crust and the solid, uppermost layer of the mantle (the lithospheric mantle). As the thickness of the crust varies, the depth to the Moho varies, from 3–6 mi (5–10 km) under the oceans to 20–40 mi (35–70 km) under the continents.

Gutenberg discontinuity seperates mantle and core.

Third and fourth statements are incorrect.