Question

This is an image of a sinkhole; sinkholes occur throughout Florida and can be very dangerous to human life. What causes a sinkhole?
Responses
A salt water intrusion from coastal areassalt water intrusion from coastal areas
B chemical weathering as groundwater reacts with limestonechemical weathering as groundwater reacts with limestone
C erosion of underlying bedrock due to tremors in Earth's mantleerosion of underlying bedrock due to tremors in Earth's mantle
D physical weathering of sand-based layers under the paved surfacesphysical weathering of sand-based layers under the paved surfaces
Question 2
About 10% of Earth's landscapes karst landscapes, which vary from the sinkholes of Florida to the caves and caverns in Virginia and Kentucky to jagged hills and pinnacle karst found in the tropics. The development of all karst landforms requires the presence of rock which is capable of being dissolved by surface water or ground water, especially if the water has a pH less than neutral or 7. What type of rock is particularly susceptible to this type of action?
Responses
A basaltbasalt
B granitegranite
C limestonelimestone
D sandstonesandstone

Answer 1

Question 1 — B. Chemical weathering as groundwater reacts with limestone.
- Sinkholes in Florida form when acidic groundwater dissolves the underlying limestone (carbonate) bedrock, creating cavities that can collapse.

Question 2 — C. Limestone.
- Limestone (calcium carbonate) is especially susceptible to dissolution by slightly acidic surface or groundwater, producing karst features like sinkholes, caves, and caverns.