The cliffs at Giant’s Causeway are known for black columns made of what?

Here is the question :

THE CLIFFS AT GIANT’S CAUSEWAY ARE KNOWN FOR BLACK COLUMNS MADE OF WHAT?

Here is the option for the question :

• Limestone
• Basalt
• Chalk
• Granite

The Answer:

And, the answer for the the question is :

Explanation:

[STC0016038]. Legend has it that Finn McCool, a giant from Ireland, built a causeway across the Irish Sea so he could fight Benandonner, a giant from Scotland. The stretch of black, basalt rocks known as the Giant’s Causeway can be located on the north coast of Northern Ireland, where Benandonner tore up the causeway after McCool’s victory.