CBSE Class 7 Answered
what are the features of primary rocks ?
Asked by ridim.kathiyal | 30 Jun, 2019, 06:25: PM
Expert Answer
Igneous rocks are also known as primary rocks. Its chief features are:
- Since igneous rocks are formed due to the cooling and solidification of the magma, these rocks are hard and resistant to erosion.
- Water seeps in only through cracks and joints in the rocks. Thus these rocks are mostly not affected by chemical weathering.
- Igneous rocks are also called primary rocks as other rocks are basically formed out of igneous rocks.
- These rocks are usually fine grained with smooth texture or may have large crystals with coarse texture.
- Since these rocks are formed due to the cooling and solidification of the magma (lava), fossils are not found in these rocks.
- Igneous rocks can be further classified into extrusive igneous rocks or intrusive igneous rocks.
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