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प्रश्न
State two characteristics of Basic Igneous Rocks.
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उत्तर
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Higher Percentage of Oxides: They have a higher percentage of iron and magnesium oxides, giving them a dark colour.
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Low Silica Content: They contain less silica compared to acidic rocks, making their magma more fluid.
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संबंधित प्रश्न
What are minerals?
Distinguish between the following pair:
Degradation and aggradation
Describe the process that leads to exfoliation.
What is Geology?
How are igneous rocks classified on the basis of their chemical composition?
How are sedimentary and igneous rocks formed?
Classify the following rock: Coal
Classify the following rock: Gneiss
Fill in the blanks
______ is formed, when the angular and coarse grains of some durable minerals are cemented together.
Fill in the blanks
______ is the best example of the wind deposited stratified rock.
How are sedimentary rocks classified?
______ is known as the primary rocks.
Match the following:
| A. | Basalt | 1. | Anthracite |
| B. | Limestone | 2. | Extrusive igneous |
| C. | Coal | 3. | Metamorphic rock |
| D. | Gneiss | 4. | Sedimentary rock |
Classify and explain the rocks.
______ are chemical substances which exist in nature.
Sedimentary rocks are called stratified rocks.
Statement (1): Sedimentary rocks consist of many layers.
Statement (2): Sedimentary rocks are formed by the sediments deposited at different points of time.
Match the following.
| A. | Basalt | 1. | Anthracite |
| B. | Limestone | 2. | Extrusive igneous |
| C. | Coal | 3. | Metamorphic rock |
| D. | Gneiss | 4. | Sedimentary rock |
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.
