Rocks and Minerals Quiz

Grade 4 · Science · Quiz

Test your knowledge of rock types, how they form, and mineral properties.

Questions

1. What is granite?

   1. A sedimentary rock
   2. A metamorphic rock
   3. An igneous rock
   4. A mineral
   Show answer

   Answer: An igneous rock

   Granite is an igneous rock formed when magma cools slowly underground, allowing large crystals to form.

2. What does the Mohs scale measure?

   1. A rock's age
   2. A mineral's hardness
   3. A rock's weight
   4. A mineral's color
   Show answer

   Answer: A mineral's hardness

   The Mohs scale measures hardness from 1 (talc, softest) to 10 (diamond, hardest).

3. Which rock type forms under heat and pressure?

   1. Igneous
   2. Sedimentary
   3. Metamorphic
   4. Volcanic
   Show answer

   Answer: Metamorphic

   Metamorphic rocks form deep underground when existing rocks are changed by intense heat and pressure.

4. What mineral is rated 10 on the Mohs hardness scale?

   1. Quartz
   2. Talc
   3. Diamond
   4. Feldspar
   Show answer

   Answer: Diamond

   Diamond is the hardest natural mineral, rated 10 on the Mohs scale. Talc is the softest at 1.

5. Sandstone is a sedimentary rock.

   Show answer

   Answer: True

   Sandstone is a sedimentary rock formed from compressed grains of sand cemented together over time.

6. Minerals are living things found in rocks.

   Show answer

   Answer: False

   Minerals are non-living, naturally occurring solids with a specific chemical composition. They are never living things.

7. Marble is a metamorphic rock formed from limestone.

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   Answer: True

   Marble is a metamorphic rock that forms when limestone is subjected to heat and pressure deep underground.

8. Rock that forms from cooled lava is called ___ rock.

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   Answer: igneous

   Igneous rocks form when magma or lava cools and solidifies. Basalt forms from fast-cooling lava; granite forms from slow-cooling magma.

9. The color a mineral leaves when scratched on a white tile is called its ___.

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   Answer: streak

   Streak is a mineral identification property — the color of the powder it leaves when scratched across a white porcelain tile.

10. In which type of rock would you most likely find a fossil?

    1. Igneous
    2. Metamorphic
    3. Sedimentary
    4. Volcanic glass
    Show answer

    Answer: Sedimentary

    Fossils form in sedimentary rock because dead organisms get buried in layers of sediment that slowly harden into rock.

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