Question

Which of the following is an example of sedimentary rock

• A. Granite
• B. Basalt
• C. Sandstone
• D. Schist

Hint:

Associate the rock types with their formation process:
- Igneous = from "fire" (molten magma/lava).
- Sedimentary = from "sediment" (sand, mud, shells).
- Metamorphic = "morphed" or changed by heat and pressure.

Answer 1

The Correct Option is C

Step 1: Understanding the Question:
We need to identify the sedimentary rock from the given list of four rock types.

Step 2: Detailed Explanation:
Let's classify each rock:
-

Granite: This is an

igneous rock.
Specifically, it is an intrusive (or plutonic) igneous rock, formed from the slow cooling of magma beneath the Earth's surface.
-

Basalt: This is an

igneous rock.
Specifically, it is an extrusive (or volcanic) igneous rock, formed from the rapid cooling of lava on the Earth's surface.
-

Sandstone: This is a classic

sedimentary rock.
It is formed from the compaction and cementation (lithification) of sand-sized grains of minerals, rock, or organic material.
-

Schist: This is a

metamorphic rock.
It is formed when other rocks (like shale) are subjected to intense heat and pressure, causing the mineral grains to recrystallize and align in layers or bands (a property called foliation).

Step 3: Final Answer:
Sandstone is the example of a sedimentary rock in the list.
This corresponds to option (C).