Welcome to the Earth’s Structure and Composition MCQs with Answers. In this post, we are sharing Earth’s Structure and Composition Multiple Choice Questions and Answers in Everyday Science section for various competitive exams in Pakistan. Each question offers a chance to enhance your knowledge regarding Earth’s Structure and Composition online MCQs Test.
What is the outermost layer of the Earth called?
a) Mantle
b) Outer core
c) Inner core
d) Crust
Which layer of the Earth is composed primarily of silicate minerals?
a) Crust
b) Mantle
c) Outer core
d) Inner core
What is the primary composition of the Earth’s inner core?
a) Iron and nickel
b) Silicate minerals
c) Magnesium and silicon
d) Sodium and potassium
Which layer of the Earth is responsible for generating the Earth’s magnetic field?
a) Crust
b) Mantle
c) Outer core
d) Inner core
What is the name of the boundary between the Earth’s crust and the underlying mantle?
a) Lithosphere
b) Asthenosphere
c) Mohorovičić discontinuity (Moho)
d) Conrad discontinuity
Which layer of the Earth is characterized by its semi-fluid, plastic-like properties?
a) Crust
b) Mantle
c) Outer core
d) Inner core
What is the term for the rigid outer layer of the Earth that includes the crust and the uppermost part of the mantle?
a) Lithosphere
b) Asthenosphere
c) Mesosphere
d) Core
Which layer of the Earth lies directly beneath the lithosphere?
a) Crust
b) Asthenosphere
c) Mesosphere
d) Outer core
What is the primary composition of the Earth’s mantle?
a) Iron and nickel
b) Silicate minerals
c) Sedimentary rocks
d) Water
Which layer of the Earth is solid and composed mainly of iron and nickel?
a) Crust
b) Mantle
c) Outer core
d) Inner core
What is the term for the zone of the mantle where convection currents occur?
a) Lithosphere
b) Asthenosphere
c) Mesosphere
d) Outer core
Which layer of the Earth is liquid and composed primarily of iron and nickel?
a) Crust
b) Mantle
c) Outer core
d) Inner core
What is the name of the boundary between the mantle and the outer core?
a) Lithosphere
b) Asthenosphere
c) Core-mantle boundary
d) Moho
Which of the following is the most abundant element in the Earth’s crust?
a) Iron
b) Oxygen
c) Silicon
d) Aluminum
What is the term for the transition zone between the Earth’s crust and mantle?
a) Lithosphere
b) Asthenosphere
c) Moho
d) Core-mantle boundary
Which layer of the Earth contains the majority of its volume and mass?
a) Crust
b) Mantle
c) Outer core
d) Inner core
What is the layer of the Earth that exhibits plastic behavior and flows slowly?
a) Lithosphere
b) Asthenosphere
c) Mesosphere
d) Outer core
Which type of rock is most commonly found in the Earth’s crust?
a) Igneous
b) Sedimentary
c) Metamorphic
d) All of the above
What is the primary difference between the Earth’s inner core and outer core?
a) Composition
b) Temperature
c) State of matter (solid vs. liquid)
d) Thickness
What is the main reason for the differentiation of Earth’s layers?
a) Volcanic activity
b) Gravitational separation based on density
c) Plate tectonics
d) Erosion
Which layer of the Earth has the highest temperature?
a) Crust
b) Mantle
c) Outer core
d) Inner core
What is the primary function of the Earth’s mantle?
a) To support the crust
b) To generate the magnetic field
c) To facilitate convection currents
d) To contain the majority of Earth’s water
Which layer of the Earth contains the most iron and nickel?
a) Crust
b) Mantle
c) Outer core
d) Inner core
What is the term for the molten rock found beneath the Earth’s crust?
a) Lava
b) Magma
c) Sediment
d) Mantle rock
Which layer of the Earth is primarily responsible for the occurrence of earthquakes?
a) Crust
b) Mantle
c) Outer core
d) Inner core
What is the term for the boundary between the Earth’s crust and the upper mantle?
a) Moho
b) Lithosphere
c) Asthenosphere
d) Core-mantle boundary
Which layer of the Earth contains convective currents that drive plate tectonics?
a) Crust
b) Mantle
c) Outer core
d) Inner core
What type of rock forms from the cooling and solidification of magma?
a) Igneous
b) Sedimentary
c) Metamorphic
d) Fossil
Which part of the Earth’s interior is composed mainly of iron and nickel and is in a molten state?
a) Crust
b) Upper mantle
c) Outer core
d) Inner core
What is the term for the rigid layer of the Earth that includes both the crust and the uppermost part of the mantle?
a) Lithosphere
b) Asthenosphere
c) Mesosphere
d) Core
Which layer of the Earth is known for its high temperatures and pressure, and where convection currents occur?
a) Crust
b) Mantle
c) Outer core
d) Inner core
What is the term for the transition zone between the lithosphere and the asthenosphere?
a) Moho
b) Lithosphere-asthenosphere boundary
c) Core-mantle boundary
d) Upper mantle
Which layer of the Earth has the lowest density?
a) Crust
b) Mantle
c) Outer core
d) Inner core
What is the main characteristic of the asthenosphere?
a) It is rigid and solid
b) It is liquid and molten
c) It flows slowly and has plasticity
d) It is primarily composed of iron
Which layer of the Earth is composed of silicate minerals with high magnesium and iron content?
a) Crust
b) Mantle
c) Outer core
d) Inner core
What geological feature forms at the boundary between the crust and the mantle?
a) Mid-ocean ridge
b) Subduction zone
c) Fault
d) Moho
Which layer of the Earth contains the majority of its volume and is composed mainly of silicate minerals?
a) Crust
b) Mantle
c) Outer core
d) Inner core
What is the primary role of the Earth’s core?
a) To support the mantle
b) To generate the magnetic field
c) To provide nutrients for the crust
d) To facilitate plate tectonics
What term describes the lower portion of the Earth’s mantle that behaves like a solid but can flow slowly?
a) Lithosphere
b) Asthenosphere
c) Mesosphere
d) Outer core
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