Islands are landmasses completely surrounded by water. They vary greatly in size, from small islets to large landmasses like Greenland. Notable examples include Madagascar, an extensive island off the southeastern coast of Africa, and the Hawaiian Islands, a group of ...
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The saying suggests that not everything that shines is necessarily a metal or valuable; some materials may be made shiny artificially, without having the inherent properties of metals. NCERT Science Textbook Curiosity Science Session 2024-2025.
Non-metallic materials can appear shiny if their surfaces are polished or coated with thin layers of plastic, wax, or other materials that create a shiny finish. Chapter 6 Materials around us Class 6 Class VI NCERT Book Curiosity Science
Examples of non-lustrous materials include paper, wood, rubber, and jute, which do not have shiny surfaces. NCERT Science Textbook Curiosity Science Session 2024-2025.
Some metals lose their lustre due to the effect of air and moisture, which can cause oxidation or tarnishing, making them appear dull or non-lustrous. NCERT Book Curiosity Science Class 6 Class 6 Science NCERT Chapter 6.