Social Science Worksheet 6 for Class VII, covering topics like Earth's crust, radius, and rock types.

Let's solve the problems step by step and explain the reasoning for each answer.

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Question 1: The uppermost layer of the Earth's surface is called

- Options:
- (a) the crust
- (b) the burst
- (c) the roads
- (d) the forest

Explanation:
The Earth's surface is divided into several layers. The outermost solid layer is called the crust. It is the thin, rigid outer layer of the Earth that we live on. The other options are incorrect because:
- "Burst" is not a geological term.
- "Roads" are man-made structures, not natural layers of the Earth.
- "Forest" refers to a type of ecosystem, not a layer of the Earth.

Correct Answer: (a) the crust

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Question 2: What is the radius of the Earth?

- Options:
- (a) 3671 km
- (b) 7163 km
- (c) 6371 km
- (d) 1736 km

Explanation:
The average radius of the Earth is approximately 6371 km. This value is well-established in geology and geography. Let's analyze the other options:
- (a) 3671 km: This is half of the Earth's diameter, not its radius.
- (b) 7163 km: This is close to the Earth's diameter, not its radius.
- (d) 1736 km: This is much smaller than the Earth's radius and is not a valid option.

Correct Answer: (c) 6371 km

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Question 3: Any natural mass of mineral matter that makes up the Earth's crust is called a

- Options:
- (a) rock
- (b) road
- (c) sediment
- (d) none of these

Explanation:
A rock is defined as any naturally occurring solid aggregate of one or more minerals or mineraloids. Rocks make up the Earth's crust. The other options are incorrect because:
- "Road" is a man-made structure, not a natural formation.
- "Sediment" refers to loose particles (like sand or clay) that can form rocks but is not the general term for the material making up the crust.
- "None of these" is incorrect since "rock" is the correct term.

Correct Answer: (a) rock

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Question 4: The process of transformation of the rock from one form to another is known as

- Options:
- (a) road cycle
- (b) food cycle
- (c) rock cycle
- (d) all of these

Explanation:
The rock cycle is the continuous process by which rocks are transformed from one type to another through various geological processes such as melting, cooling, erosion, compaction, and metamorphism. The other options are incorrect because:
- "Road cycle" is not a geological term.
- "Food cycle" refers to biological processes, not geological ones.
- "All of these" is incorrect since only "rock cycle" is relevant.

Correct Answer: (c) rock cycle

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Question 5: Rocks which contain fossils are called

- Options:
- (a) metamorphic rocks
- (b) igneous rocks
- (c) core
- (d) sedimentary rocks

Explanation:
Fossils are typically found in sedimentary rocks because these rocks form from the accumulation of sediments (like sand, mud, or organic material) over time. Sedimentary rocks provide the ideal conditions for fossil preservation. The other options are incorrect because:
- Metamorphic rocks are formed by the transformation of existing rocks under heat and pressure, and they rarely contain fossils.
- Igneous rocks are formed from the cooling and solidification of magma or lava and do not typically contain fossils.
- "Core" refers to the inner part of the Earth, not a type of rock.

Correct Answer: (d) sedimentary rocks

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Final Answers:

1. (a) the crust
2. (c) 6371 km
3. (a) rock
4. (c) rock cycle
5. (d) sedimentary rocks

Boxed Final Answer:
\[
\boxed{(a), (c), (a), (c), (d)}
\]