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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
Granite is an example of intrusive ________ rocks.
Write True or False. Rewrite the false statement correctly :
Basalt is an example of an intrusive igneous rock.
Write True or False. Rewrite the false statement correctly :
Igneous and sedimentary rocks can change into metamorphic rocks.
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?
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.
Distinguish between the following:
Plutonic and Volcanic rocks.
What physical agents are involved in the sedimentary rocks?
Classify the following rock: Limestone
Classify the following rock: Graphite
Give one word for the following.
Rocks formed by the cooling and solidification of molten rock from beneath the earth crust.
Why fossils are preserved in Sedimentary and not in Igneous rocks?
Give an example of a Plutonic rock.
Give reasons for the following
Man’s habitat is the biosphere and not the lithosphere in the true sense.
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 |
Parent Rock is converted to loose Rock by ______.
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 |
