science
Grade-4-
Easy
Question
Which of the following rock looks smooth and black in color?
- Conglomerate
- Sandstone
- Limestone
- Obsidian
Hint:
The obsidian rock looks smooth and black.
The correct answer is: Obsidian
- The obsidian rock looks smooth and black.
- It has a glassy texture which has a smooth surface.
- It is an extrusive igneous rock.
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