Earth's Layers and Seismic Activity Quiz

What is the thickness of the crust under the mountainous areas and in particular the Himalayas?

• 50-55 km

• 60-65 km

• 70-75 km

• 30-35 km

The discontinuity which marks the lower boundary of the crust is ______________

• Crust-Mantle discontinuity

• Oceanic discontinuity

• SIAL layer

• Mohorovicic discontinuity

The density of the oceanic layer in the crust is said to be ____________

• 3.00 g/cc

• 2.50 g/cc

• 1.90 g/cc

• 2.00 g/cc

The depth up to which the mantle is said to exist is ________

• 2000 km

• 1500 km

• 2900 km

• 1800 km

Which of the following is not true about Asthenosphere?

• It is present in the upper mantle

• It is in solid state

• It is the source of volcanic activity

• It is in plastic rather than solid state

Which of the following is true about the inner core?

• It is believed to be a semi solid body

• It is believed to be a solid body

• It is believed to be a liquid body

• It is believed to be a gaseous body.

The layer which does not transmit the S-waves is _______

• Outer core

• Crust

• Mantle

• Inner core

The density of the Earth at its centre is said to be ________

• 9.9 g/cc

• 8.8 g/cc

• 13 g/cc

• 12.7 g/cc

The layer which is said to support the slow-moving tectonic plates is ________

• Asthenosphere

• Lithosphere

• Mohorovic sphere

• Core layer

The layer which is believed to be the source of volcanic activity is ________

• Inner core

• Outer core

• Asthenosphere

• Mohorovicic layer