Geography
Sam was working under a geologist. He lost his balance and dropped the bags containing igneous rocks and sedimentary rocks and the rocks got mixed. How would he separate them?
- Igneous rocks are hard.
- Igneous rocks are crystalline.
- Sedimentary rocks have strata showing layers.
- Sedimentary rocks are soft.
Rocks
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Answer
Sedimentary rocks have strata showing layers.
Reason — Igneous rocks are hard, compact, granular and crystalline, while sedimentary rocks are softer than igneous rocks and show layers. However, the best way to identify them would be by their layers which can be clearly seen due to sediments' deposition over one another.
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Related Questions
The bonding together of compacted sediments by natural bonding materials such as calcium compounds, silica and iron:
- Compaction
- Lithification
- Cementation
- None of the above
Transported sediments get deposited in layers leading to increased pressure and temperature on the lower layers. Select the correct sequence of processes involved in the lithification of these sediments.
- Compaction — Evaporation — Cementation.
- Evaporation — Compaction — Cementation.
- Evaporation — Cementation — Compaction.
- Evaporation — Dehydration — Cementation.
Assertion (A): Igneous rocks are called primary rocks.
Reason (R): They were the first to be formed.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R does not explain A.
- A is true but R is false.
- A is false but R is true.
The rocks like peat, lignite, bituminous and anthracite are example of:
- Igneous rocks
- Mechanical rocks
- Metallic rocks
- Carbonaceous rocks