science
Grade-4-
Easy
Question
Which of the following rock is looks smooth and black in color?
- Granite
- Quartzite
- Limestone
- Obsidian
Hint:
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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