Rocks - Practice Test 4

Attempt the quiz above first, then review every question with its correct answer and a short explanation below.

1. Q1.Slate is typically formed from the metamorphism of:

   • A.Shale / Mudstone✓ Correct Answer
   • B.Sandstone
   • C.Limestone
   • D.Granite

   Explanation: Low-grade metamorphism of shale produces slate.

2. Q2.Schist is formed from the metamorphism of:

   • A.Slate✓ Correct Answer
   • B.Sandstone
   • C.Limestone
   • D.Granite

   Explanation: Shale -> Slate -> Phyllite -> Schist -> Gneiss.

3. Q3.Which rock is known for its banding pattern?

   • A.Gneiss✓ Correct Answer
   • B.Marble
   • C.Quartzite
   • D.Granite

   Explanation: Gneissic banding is alternating light and dark layers.

4. Q4.A mushroom rock is formed by:

   • A.Wind erosion✓ Correct Answer
   • B.Water erosion
   • C.Glacial erosion
   • D.Volcanic eruption

   Explanation: Wind erodes the base of a rock more than the top.

5. Q5.Stalactites and Stalagmites are found in:

   • A.Limestone caves✓ Correct Answer
   • B.Granite mountains
   • C.Basalt plateaus
   • D.Sandstone deserts

   Explanation: They are depositional features of groundwater in limestone terrain (Karst topography).

6. Q6.Geodes are hollow rocks lined with:

   • A.Crystals✓ Correct Answer
   • B.Mud
   • C.Oil
   • D.Coal

   Explanation: Geodes contain crystals (often quartz/amethyst) inside.

7. Q7.Anthracite is the highest grade of:

   • A.Coal✓ Correct Answer
   • B.Iron
   • C.Gold
   • D.Copper

   Explanation: Anthracite is hard coal with high carbon content.

8. Q8.Bauxite is an ore of:

   • A.Aluminum✓ Correct Answer
   • B.Iron
   • C.Copper
   • D.Zinc

   Explanation: Bauxite is a sedimentary rock and the main ore of aluminum.

9. Q9.Magnetite and Hematite are ores of:

   • A.Iron✓ Correct Answer
   • B.Copper
   • C.Aluminum
   • D.Lead

   Explanation: They are iron oxides.

10. Q10.Which rock is used to make cement?

    • A.Limestone✓ Correct Answer
    • B.Sandstone
    • C.Granite
    • D.Basalt

    Explanation: Limestone is the primary raw material for cement.

11. Q11.Exfoliation is a type of weathering common in:

    • A.Granite rocks✓ Correct Answer
    • B.Limestone
    • C.Shale
    • D.Sandstone

    Explanation: Granite peels off in layers (onion-skin weathering) due to pressure release.

12. Q12.A rock containing metals that can be mined is called:

    • A.Ore✓ Correct Answer
    • B.Gem
    • C.Crystal
    • D.Fossil

    Explanation: An ore is rock with economically valuable minerals.

13. Q13.The texture of an igneous rock depends on:

    • A.Rate of cooling✓ Correct Answer
    • B.Color
    • C.Shape
    • D.Location

    Explanation: Fast cooling = fine grains; Slow cooling = coarse grains.

14. Q14.Scoria is a type of:

    • A.Volcanic rock✓ Correct Answer
    • B.Sedimentary rock
    • C.Metamorphic rock
    • D.Mineral

    Explanation: Scoria is a vesicular volcanic rock (cinder).

15. Q15.Which of these forms from organic remains?

    • A.Limestone (some types) and Coal✓ Correct Answer
    • B.Granite
    • C.Basalt
    • D.Gneiss

    Explanation: Organic sedimentary rocks form from plants/animals.

16. Q16.Rocks formed by mechanical weathering and accumulation are:

    • A.Clastic Sedimentary rocks✓ Correct Answer
    • B.Chemical Sedimentary rocks
    • C.Organic Sedimentary rocks
    • D.Igneous rocks

    Explanation: Clastic rocks (sandstone, shale) are made of fragments.

17. Q17.The hardest naturally occurring rock is:

    • A.Diamond (Mineral), Quartzite (Rock)✓ Correct Answer
    • B.Talc
    • C.Limestone
    • D.Shale

    Explanation: Quartzite is an extremely hard metamorphic rock.

18. Q18.Which rock is composed mainly of calcite?

    • A.Limestone✓ Correct Answer
    • B.Sandstone
    • C.Granite
    • D.Basalt

    Explanation: Limestone consists of Calcium Carbonate (Calcite).

19. Q19.Loess is a sedimentary deposit formed by:

    • A.Wind✓ Correct Answer
    • B.Water
    • C.Ice
    • D.Volcano

    Explanation: Loess is windblown silt.

20. Q20.Till is a sedimentary deposit formed by:

    • A.Glaciers✓ Correct Answer
    • B.Wind
    • C.Rivers
    • D.Ocean waves

    Explanation: Till is unsorted glacial sediment.