1. What is the correct sequence of Earth's layers starting from the surface and going inward?
a) Inner Core, Outer Core, Mantle, Crust
b) Crust, Outer Core, Mantle, Inner Core
c) Crust, Mantle, Outer Core, Inner Core
d) Mantle, Crust, Inner Core, Outer Core
Answer: c) Crust, Mantle, Outer Core, Inner Core
The following are prominent layers of Earth:
1. Crust
A. Upper Crust [ Continental Crust -SiAl or Oceanic Crust ( SiMa)]
B. Lower Crust/Asthenosphere
2. Mantle[ Upper and Lower Mantle]
3. Core[ Outer and Lower Core]
2. The "Moho" discontinuity marks the boundary between which two layers?
a) Upper Mantle and Lower Mantle
b) Crust and Mantle
c) Outer Core and Inner Core
d) Lithosphere and Asthenosphere
Answer: b) (Crust and Mantle)
Five major discontinuities in the Earth's interior:
1. Conrad-between upper crust and lower crust.
2. Moho-between crust and upper mantle
3. Repetti- between upper mantle and lower mantle
4. Gutenberg- between lower mantle and outer core
5. Lehmann- outer core and Upper core
3. Which part of the Earth's interior is known as the "NIFE" layer?
a) Crust
b) Mantle
c) Core
d) Asthenosphere
Answer. c) Core
Continental Crust: SiAl ( Silica + Aluminium)
Oceanic Crust: SiMa ( Silica + Magnesium)
Core: NEFE ( Nickel + Ferrous/iron)
4. What is the most abundant element found in the Earth's continental crust?
a) Silicon
b) Iron
c) Oxygen
d) Aluminum
Answer: c) Oxygen
The most abundant elements in the Earth's crust are: Oxygen ( 46.6 %) > Silica> Aluminium> Ferrous> Calcium
5. What is the most abundant metal found in the Earth's continental crust?
a) Silicon
b) Iron
c) Oxygen
d) Aluminum
Answer. d) Aluminum
Aluminium ( 8 %) > Iron ( 5%) of the Earth's crust weight.
6. Which layer of Earth is in liquid form?
a) Asthenosphere
b) Lower Mantle
c) Outer Core
d) Inner Core
Answer. c) Outer Core
Solid form: Upper Crust and Inner Core
Semi-liquid: Asthenosphere
Liquid: Outer Core
7. Which layer of the Earth is responsible for generating the magnetic field?
a) Crust
b) Mantle
c) Outer Core
d) Inner Core
Answer: c) Outer Core
The Outer core is composed of molten iron and nickel, and it is in a liquid state. It consists mostly of molten iron and nickel. The magnetic field is generated by electric current generated by the motion of a mixture of iron and nickel here.
8. Which of the following correctly represents the state of matter in the Earth's layers from crust to inner core?
a) Solid → Liquid → Solid → Gas
b) Solid → Solid → Liquid → Solid
c) Solid → Plastic → Liquid → Solid
d) Solid → Liquid → Liquid → Gas
Answer: c)
Crust: Solid
Mantle: Solid but behaves plastically in the asthenosphere
Outer core: Liquid
Inner core: Solid
9. Consider the following statements:
1. The Inner Core of the Earth is solid in nature.
2. The temperature of the Inner Core is comparable to the surface temperature of the Sun.
3. The Inner Core is composed mainly of iron and nickel.
Which of the statements given above are correct?
a) 1 and 2 only
b) 2 and 3 only
c) 1 and 3 only
d) 1, 2 and 3
Answer: (d) 1, 2 and 3
The Inner Core is solid due to extremely high pressure.
Its temperature is estimated to be around 5,000–6,000°C, comparable to the Sun's surface.
It is composed predominantly of iron and nickel.
10. Consider the following statements regarding the Earth's interior:
1. The Mantle is the thickest layer of the Earth.
2. The Asthenosphere lies below the Lithosphere.
3. The Asthenosphere is completely molten.
Which of the statements given above is/are correct?
a) 1 and 2 only
b) 2 and 3 only
c) 1 and 3 only
d) 1, 2 and 3
Answer: (a) 1 and 2 only
Statement 1 is correct. The Mantle is the thickest layer of the Earth, extending to a depth of about 2,900 km.
Statement 2 is correct. The Asthenosphere is located just below the Lithosphere.
Statement 3 is incorrect. The Asthenosphere is partially molten (semi-molten), not completely molten.
You may also like:
ConversionConversion EmoticonEmoticon