North Korea conducts nuclear test

The video explains the process of an underground explosion occurring 800 meters below the surface. This explosion generates shock waves that can be measured using a seismograph. The intense heat from the explosion melts the surrounding rock, forming a cavern. Subsequently, the soil above collapses into this cavern, creating a visible crater on the surface, which can be observed via satellite imagery.

What is the depth at which the explosion occurs?

• 1000 meters

• 800 meters

• 1200 meters

• 500 meters

What instrument is used to measure the shock waves from the explosion?

• Barometer

• Thermometer

• Anemometer

• Seismograph

What happens to the rock within the blast radius of the explosion?

• It evaporates

• It solidifies

• It melts

• It fractures

What is formed underground as a result of the explosion?

• A trench

• A tunnel

• A cavern

• A pit

How can the crater formed by the explosion be observed?

• By radar

• By sonar

• By satellite

• By drone