I WONDER - How was glass formed naturally?

The video tutorial explains the natural formation of glass, specifically obsidian, which occurs when sand from an erupting volcano melts in lava and cools rapidly upon contact with water. It highlights the dark greenish-black color of obsidian and how its discovery led humans to experiment and eventually learn to manufacture glass.

What natural process leads to the formation of obsidian?

• Sand melting in volcanic lava and cooling quickly

• Sand being mixed with minerals in the ocean

• Sand being compressed over millions of years

• Sand being heated by the sun

What happens to sand when it comes into contact with volcanic lava?

• It turns into a gas

• It melts and forms obsidian

• It becomes a solid rock

• It evaporates

What is the color of obsidian?

• Bright red

• Dark greenish-black

• Clear and transparent

• Light blue

Which of the following is NOT a characteristic of obsidian?

• Bright yellow color

• Formed from volcanic activity

• Naturally occurring

• Dark greenish-black color

How did the discovery of obsidian influence human innovation?

• It led to the development of new farming techniques

• It inspired the creation of new musical instruments

• It prompted experiments that eventually led to the creation of man-made glass

• It resulted in the invention of the wheel