Question : Spot the odd item in the following :
Option 1: Basalt
Option 2: Ruby
Option 3: Emerald
Option 4: Sapphire
Correct Answer: Basalt
Solution : The correct answer is Basalt.
According to their formation rocks are divided into three types. They are sedimentary rocks, igneous rocks, and metamorphic rocks. The basalt is an igneous rock that is it is formed because of volcanic eruption of basaltic lava. For example- Deccan traps. While ruby, sapphire and emerald are semi-precious gemstones. Examples of sedimentary rocks- sandstone, limestone, soapstone etc. Example of metamorphic rocks- marble, gneiss, granite etc.
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