Igneous rocks form when magma (molten rock) cools and crystallizes, either at volcanoes on the surface of the Earth or while the melted rock is still inside the crust. All magma develops underground, in the lower crust or upper mantle, because of the intense heat there.

National parks with excellent examples of intrusive igneous rocks include:

• Acadia National Park, Maine [Geodiversity Atlas] [Park Home]
• Joshua Tree National Park, California [Geodiversity Atlas] [Park Home]
• Yosemite National Park, California [Geodiversity Atlas] [Park Home]

Surprisingly, the edge of a piece of obsidian is superior to that of a surgeon’s steel scalpel. It is 3 times sharper than diamond and between 500-1000 times sharper than a razor or a surgeon’s steel blade resulting in easier incisions and fewer microscopic ragged tissue cuts.

tungsten needle

Top 5 Famous and Deadly Swords

1. #1 Joyeuse.
2. #2 Honjo Masamune.
3. #3 Zulfiqar:
4. #4 The Sword of Mercy:
5. #5 Napoleon’s Sword: In 1799, Napoleon Bonaparte became the military and political leader of France after staging a coup d’état. Five years later the French Senate proclaimed him emperor.

15 Deadliest Legendary Swords In The World

• 8 Curtana – Sword of Mercy.
• 7 Curved Saber of San Martin.
• 6 Joyeuse.
• 5 Muramasa.
• 4 Honjo Masamune.
• 3 Kusanagi.
• 2 Sword of Goujian.
• 1 Wallace Sword.

The Vrbas is a 150-mile long river in the heart of Bosnia, right near the city of Banja Luka. Archaeologist and curator at the Museum of the Republika Srpska, Ivana Pandzic, said the sword was stuck in “a solid rock, so special care was needed when pulling it out” in comments obtained by The Sun.

The 14th century sword was discovered at in the Vrbas River, near the village of Rakovice in the north of Bosnia and Herzegovina. Driven into a solid bit of rock 36ft below the surface and becoming stuck for years in water – the sword has now been dubbed ‘Excalibur’ after the legendary tale of King Arthur.