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प्रश्न
What is meant by a rock?
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उत्तर
A rock is defined as an aggregate of one or more minerals that forms a part of the Earth’s crust. Rocks do not have a definite chemical composition like compounds but are usually mixtures of various minerals.
Most rocks are made up of silica, quartz, and feldspar. They may be crystalline, compact, or glass-like in nature. Examples of rocks include stone, clay, lava, sand, chalk, coal, and marble.
संबंधित प्रश्न
Fill in the blank
Conglomerate is an example of _____________ rocks.
Fill in the blank
Sedimentary rocks are formed from _____________ accumulated over long periods.
Write True or False. Rewrite the false statement correctly :
Basalt is an example of an intrusive igneous rock.
How are igneous rocks formed?
Which rocks are associated with ores of metals?
Name the rocks which are most widespread on the earth.
Explain this term associated with rocks: Extrusive Igneous Rocks
Distinguish between the following:
Calcarious and Carbonacious rocks.
State the types of rocks for the formation of which the following process is involved.
Formation of large crystals, coarse texture and slow cooling and compaction.
Name different types of sedimentary rocks.
Classify the following rock: Rock salt
Classify the following rock: Basalt
Give one word for the following.
The lower part of ocean floor, comprising mainly of silica.
Give one example of an area of: Igneous rocks
How is sand that flows in a river formed? Collect some information about where the sand comes from.
How are igneous rocks formed?
Which Soils are formed by the weathering of metamorphic rocks?
______ into slate caused by thermal metamorphism.
What are the uses of soil?
Match the following:
| A. | Basalt | 1. | Anthracite |
| B. | Limestone | 2. | Extrusive igneous |
| C. | Coal | 3. | Metamorphic rock |
| D. | Gneiss | 4. | Sedimentary rock |
