science
Grade-4-
Easy

Question

Which of the following rock is looks smooth and black in color?

  1. Granite
  2. Quartzite
  3. Limestone
  4. Obsidian

hintHint:

Obsidian rock is soft and looks black in color.

The correct answer is: Obsidian


    • Obsidian rock is an extrusive rock.
    • It is formed by the cooling and crystallization of magma on the surface of the earth's crust.
    • So it is soft and black in color.

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