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
Classify the following rocks by selecting the correct option given below:
Gneiss
With the help of your teacher, collect different types of rocks such as granite, sandstone, limestone, marble, slate, graphite, etc. and prepare a chart containing information about their colour, hardness, texture, and permeability.
State two characteristics of Basic Igneous Rocks.
Name the types Sedimentary rocks based on agents of formation.
Distinguish between the following:
Plutonic and Volcanic rocks.
State the types of rocks for the formation of which the following process is involved.
Accumulation takes place over long periods of time in seas, lakes and streams.
Classify the following rock: Shale
Classify the following rock: Dolomite
Classify the following rock: Graphite
Give one word for the following.
Igneous rocks, which contain a high percentage of silica.
Fill in the blanks
______ rocks are formed by the deposition of shells and skeletons of organism.
Give one example of an area of: Metamorphic rocks,
Give one example of an area of: Sedimentary rocks in India
Distinguish between Intrusive and Extrusive Rocks
How is sand that flows in a river formed? Collect some information about where the sand comes from.
Explain the type of Igneous Rocks.
The world Igneous is derived from the Latin word ______ meaning ______.
| A | B | ||
| 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. | Basalt | 1. | Anthracite |
| B. | Limestone | 2. | Extrusive igneous |
| C. | Coal | 3. | Metamorphic rock |
| D. | Gneiss | 4. | Sedimentary rock |
Match the following:
| A. | Basalt | 1. | Anthracite |
| B. | Limestone | 2. | Extrusive igneous |
| C. | Coal | 3. | Metamorphic rock |
| D. | Gneiss | 4. | Sedimentary rock |
