Class 9 Earth's Structure Mock Test (ICSE)

Topics in Earth's Structure

• Crust, mantle and core
• Lithosphere and asthenosphere
• Composition of each layer

Earth's Structure practice questions with answers

1. Q1Multiple choice·1 mark
   Which of the following metallic elements is predominantly found in the Earth's core (Nife layer)?

   1. (a)Nickel and Iron
   2. (b)Calcium and Sodium
   3. (c)Silicon and Magnesium
   4. (d)Silicon and Aluminium
   Show answer and step marks

   1. Correct option: (a) Nickel and Iron+1

   Answer: (a)
2. Q2Multiple choice·1 mark
   The oceanic crust is primarily composed of silica and which of the following mineral constituents?

   1. (a)Aluminium
   2. (b)Iron
   3. (c)Magnesium
   4. (d)Nickel
   Show answer and step marks

   1. Correct option: (c) Magnesium+1

   Answer: (c)
3. Q3Multiple choice·1 mark
   The semi-fluid, plastic layer of the upper mantle upon which the lithospheric plates float is called the:

   1. (a)Hydrosphere
   2. (b)Barysphere
   3. (c)Mesosphere
   4. (d)Asthenosphere
   Show answer and step marks

   1. Correct option: (d) Asthenosphere+1

   Answer: (d)
4. Q4Multiple choice·1 mark
   The transitional boundary that separates the Earth's crust from the underlying mantle is known as the:

   1. (a)Repetti discontinuity
   2. (b)Mohorovicic discontinuity
   3. (c)Lehmann discontinuity
   4. (d)Gutenberg discontinuity
   Show answer and step marks

   1. Correct option: (b) Mohorovicic discontinuity+1

   Answer: (b)

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