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प्रश्न
What are minerals?
उत्तर
Minerals are natural inorganic substances having a crystalline form with definite physical and chemical properties. The most common minerals in the earth’s crust are silica, quartz, feldspar, mica, calcite, dolomite, gypsum, etc. There are about 2,000 minerals in the earth’s crust and these combine differently to form various kinds of rocks.
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संबंधित प्रश्न
Classify the following rocks by selecting the correct option given below:
sandstone
Classify the following rock: Slate
Fill in the blanks
______ rock contain a low percentage of silica and a high percentage of basic oxides.
Fill in the blanks
Extrusive rocks are also known as ______ rocks.
Give reasons for the following
Silicates are the most common rock forming minerals.
Chemical sedimentary rocks are found in the beds of reservoirs.
The world Igneous is derived from the Latin word ______ meaning ______.
Intrusive Igneous rocks are also called ______ rocks.
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 |
