Sinkhole swallows building in Chinese city

The video tutorial explains how landscapes with limestone bedrock are affected by acidic groundwater, leading to the dissolution of rock and formation of cavities and caves. It discusses how vibrations from construction or the inability of caverns to support surface weight can cause collapses. The video also highlights warning signs of sinkholes, such as cracks in walls, pooling rainwater, and misaligned doors and windows.

What is the primary effect of acidic groundwater on limestone bedrock?

• It changes the color of the rock.

• It strengthens the rock.

• It dissolves the rock.

• It makes the rock more porous.

Which of the following can trigger a collapse in limestone landscapes?

• Strong winds

• Nearby construction vibrations

• Heavy rainfall

• Earthquakes

What is a common reason for a cavern to collapse?

• The cavern is too deep.

• The cavern is too wide.

• The cavern cannot support the surface weight.

• The cavern is filled with water.

Which of the following is a warning sign of a potential sinkhole?

• Increased bird activity

• New cracks in building walls

• Decreased water levels in ponds

• Sudden plant growth

What might indicate a sinkhole if doors and windows are not functioning properly?

• They are slanting or sagging.

• They are locked.

• They are blocked by furniture.

• They are painted shut.