Most of the earth’s crust, which is the surface of the earth, is composed of igneous rock, Igneous rock is made from melted rock called magma which is found inside the earth. When magma pushes through cracks in the crust it is referred to as lava. This lava cools and hardens and becomes igneous rock. Examples of igneous rocks are granite and obsidian.
Another type of rock in called sedimentary. Sedimentary rock is composed of layers of sand, mud, and pebbles. These layers of sediment evolved over many years at bottoms of lakes and
seas, then pressed together. Over time, the layers hardened and became stone. Examples of [1x4=4] CGBSE SUPPORT
sedimentary rock are limestone, made of shells, sandstone, where small grains of sand are visible.
A third type of rick is metamorphic rock. Metamorphic rocks began their lives as other rocks. Then, over years and years. being buried deep in the ground, time, heat and pressure changed them into metamorphic rocks. Examples of metamorphic rock are marble and quartzite.
Rocks live forever. They are the oldest objects on the planet, and forever change to become new rocks over time.
Q.-13. On the basis of your reading of the above passage make notes on it using headings and sub- headings. Use recognizable abbreviations wherever necessary. [1x4=4]
Q-14. Write a summary of the passage in more than 80 words and also suggest a suitable title.
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bhai sidha q
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