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Question
Give reasons for the following
Rocks are of great economic significance.
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Solution
Rocks are of great economic significance Some of the main benefits of rocks are as follows :
- After disintergration, they turn into valuable soils.
- They are the store-houses of a large number of minerals.
- They are the source of precious metals like gold, silver, platinum etc.
- They are source of fuel-minerals.
- They provide different types of stones.
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A category of rock which is formed by the alteration of the parent rock due to heat and pressure is called: ______________.
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Sedimentary rocks are formed by the cooling and solidification of molten rock called magma
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Name any two characteristics of Igneous Rocks.
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The outer layer of the earth.
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Formed when mud layers compacted under great pressure composing 80% of this rock.
Give an example of a Plutonic rock.
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| (a) | Igneous | (i) | Magma |
| (b) | Sedimentary | (ii) | Transformation |
| (c) | Metamorphic | (iii) | Gypsum |
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| (e) | Rock Cycle | (v) | Marble |
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The types of rocks based on formation are
What are the uses of soil?
Statement (1): Sedimentary rocks consist of many layers.
Statement (2): Sedimentary rocks are formed by the sediments deposited at different points of time.
Statement (1): Sedimentary rocks consist of many layers.
Statement (2): Sedimentary rocks are formed by the sediments deposited at different points of time.
Statement (1): Sedimentary rocks consist of many layers.
Statement (2): Sedimentary rocks are formed by the sediments deposited at different points of time.
