Science Class 5 Other

Asked by AKSHAY GURU VARADHARAJAN · SRI CHAITANYA TECHNO SCHOOL, JAYANTI NAGAR.

Name an igneous rock which is smooth, glassy and used in making jewellery.

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Answer: C. Obsidian

The correct answer is C) Obsidian. It is an igneous rock formed when lava cools so rapidly that crystals cannot grow, resulting in a smooth, glassy texture. Because of its deep black, reflective appearance, it is often polished and used to make jewellery like beads and pendants. In ancient times, its ability to break into extremely sharp edges also made it ideal for tools and weapons.

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