Deepest hole on Earth

What is the Kola Superdeep Borehole?

• C. A record-breaking oil drilling operation

• B. A petroleum exploration project

• A. A scientific experiment to study the Earth's crust

• D. A method to extract water from deep underground

When did the drilling for the Kola Superdeep Borehole begin?

• A. 1960

• B. 1970

• C. 1980

• D. 1990

What was the main goal of drilling the Kola Superdeep Borehole?

• C. To study the nature of the Earth's crust

• B. To reach the Earth's mantle

• A. To extract water from deep underground

• D. To find petroleum reserves

What method was devised to drill the Kola Superdeep Borehole?

• D. Using hydraulic fracturing

• B. Using explosives to create the hole

• C. Only rotating the drill bit at the end of the shaft

• A. Rotating the entire shaft

What surprising discovery was made about the water found deep underground?

• D. It was radioactive in nature

• C. It was not suitable for human consumption

• A. It originated from groundwater sources

• B. It was formed from hydrogen and oxygen squeezed out of rock crystals

At what depth were microscopic fossils discovered during the drilling?

• C. 9.7 kilometers

• B. 6.7 kilometers

• A. 3.7 kilometers

• D. 12.7 kilometers

What caused the drilling to come to a stop at 12 kilometers depth?

• D. Technical malfunction of the drilling equipment

• C. Extreme heat from the rocks

• B. The discovery of valuable minerals

• A. Lack of funding

How far did the Kola Superdeep Borehole make it into the Earth's layers?

• D. 20 percent

• C. 2 percent

• B. 0.2 percent

• A. 0.002 percent

What is the temperature of the rocks at 12 kilometers depth?

• D. Over 180 degrees Celsius

• C. 150 degrees Celsius

• B. 100 degrees Celsius

• A. 50 degrees Celsius

Where can viewers find more space news and information?

• D. On the main SciShow channel

• C. On Subbable

• B. On YouTube channel SciShow Space

• A. On Facebook and Twitter