Igneous rocks are formed by the cooling, solidification, and crystallisation of molten magma either beneath the surface or on the surface of the Earth. When magma cools slowly beneath the surface, it forms intrusive igneous rocks with large crystals. When it erupts and cools quickly on the surface as lava, it forms extrusive igneous rocks with fine grains.
Advertisements
Advertisements
Question
Describe how igneous rocks are formed.
Short Answer
Advertisements
Solution
shaalaa.com
Rock and it's Types
Is there an error in this question or solution?
Chapter 6: Rocks - EXERCISES [Page 64]
APPEARS IN
RELATED QUESTIONS
Fill in the blank
Conglomerate is an example of _____________ rocks.
Classify the following rocks by selecting the correct option given below:
shale
Classify the following rocks by selecting the correct option given below:
sandstone
How are rocks different from minerals?
How are igneous rocks formed?
The photograph shows you a type of rock that is widely used in the construction industry.
- Name the type of rock.
- How is it formed?
State two characteristics of Basic Igneous Rocks.
Name two important landforms made by Igneous Rocks.
Distinguish between Thermal metamorphism and Dynamic metamorphism.
Classify the following rock: Rock salt
Fill in the blanks
Extrusive rocks are also known as ______ rocks.
Give one example of an area of: Igneous rocks
Why are Sedimentary rocks called the Secondary rocks?
Which types of rocks are predominantly found at the following locations?
- Central Maharashtra
- South Konkan
- Vidarbha
Diamond is an example of _______ rock.
Match the following:
| (a) | Igneous | (i) | Magma |
| (b) | Sedimentary | (ii) | Transformation |
| (c) | Metamorphic | (iii) | Gypsum |
| (d) | Molten material | (iv) | Basalt |
| (e) | Rock Cycle | (v) | Marble |
Explain the type of Igneous Rocks.
Match the following.
| A. | Basalt | 1. | Anthracite |
| B. | Limestone | 2. | Extrusive igneous |
| C. | Coal | 3. | Metamorphic rock |
| D. | Gneiss | 4. | Sedimentary rock |
Match the following:
| Group 'A' | Group 'B' | ||
| A. | Granite | 1. | Bedrock |
| B. | Soil layer | 2. | Plutonic rock |
| C. | Barren island | 3. | Strip farming |
| D. | Soil conservation | 4. | Active Volcano |
Match the following:
| A. | Basalt | 1. | Anthracite |
| B. | Limestone | 2. | Extrusive igneous |
| C. | Coal | 3. | Metamorphic rock |
| D. | Gneiss | 4. | Sedimentary rock |
