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UCE (O-Level) The lithosphere — practice questions

Explore 3 free The lithosphere questions in UCE (O-Level) Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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The lithosphere questions and exercises with answers

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Which parts of the Earth make up the lithosphere?Read the answer and worked solution →Molten magma reaches the surface as lava and then solidifies. What kind of rock forms?Read the answer and worked solution →An existing rock is buried and subjected to intense heat and pressure over a long period. Which kind of rock results?Read the answer and worked solution →

Worked practice questions

Which parts of the Earth make up the lithosphere?

  1. The core and lower mantle
  2. The crust and the ocean
  3. The crust and upper mantle
  4. The mantle and the core
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Correct answer: C. The crust and upper mantle

1. Cutting the Earth in half would show a core, a mantle and a thin outer crust. 2. The lithosphere is the solid outermost shell of the planet. 3. It includes the crust and the upper part of the mantle. 4. The core lies far too deep to form part of the lithosphere. _Source: Siyavula Physical Sciences Grade 11 (Everything Science, CC BY 4.0), Chapter 14: The lithosphere_

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Molten magma reaches the surface as lava and then solidifies. What kind of rock forms?

  1. Sedimentary rock
  2. Metamorphic rock
  3. Crystalline rock
  4. Igneous rock
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Correct answer: D. Igneous rock

1. Rocks are grouped as igneous, sedimentary or metamorphic according to how they formed. 2. Igneous rocks form when magma is brought to the surface as lava and then solidifies. 3. Granite and basalt are given as examples of igneous rock. 4. Sedimentary rock instead forms when fragments and particles are deposited and compacted over time. _Source: Siyavula Physical Sciences Grade 11 (Everything Science, CC BY 4.0), Chapter 14: The lithosphere_

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An existing rock is buried and subjected to intense heat and pressure over a long period. Which kind of rock results?

  1. Metamorphic rock
  2. Sedimentary rock
  3. Igneous rock only
  4. Volcanic lava rock
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Correct answer: A. Metamorphic rock

1. The starting material here is rock that already exists, not fresh magma. 2. Igneous rock needs magma to reach the surface as lava and then solidify. 3. Sedimentary rock needs loose fragments to be deposited and compacted. 4. Neither of those describes an existing rock squeezed and heated in place. 5. Metamorphic rock is formed when any other rock type is subjected to intense heat and pressure over time. 6. Slate and marble are the examples given, and both begin life as some other rock. _Source: Siyavula Physical Sciences Grade 11 (Everything Science, CC BY 4.0), Chapter 14: The lithosphere_

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