The correct answer is: C. flow condition occurring in cohesionless soils.
Quicksand is a fluid-like state of a soil (a mixture of sand and water) that can occur when the sand is saturated with water and loses its strength. This can happen when the sand is loose and has a high water content, or when it is under pressure. When quicksand forms, it can be difficult to walk or move through, and people can sink into it if they are not careful.
Quicksand is not a type of sand, but rather a flow condition that can occur in any type of sand. It is most common in areas with high water tables, such as near rivers or lakes. Quicksand can also occur in areas with sandy soil that has been disturbed, such as by construction or excavation.
If you find yourself in quicksand, the best thing to do is to stay calm and avoid panicking. Panicking will only make it more difficult to escape. Try to lie down in the quicksand and spread your weight out as much as possible. This will help to reduce the pressure on the sand and make it easier to float. Once you are floating, you can slowly move your arms and legs to try to swim to safety.
If you are unable to escape on your own, call for help. Someone with experience in dealing with quicksand can help you to get out safely.
Here is a brief explanation of each option:
- A. type of sand: Quicksand is not a type of sand, but rather a flow condition that can occur in any type of sand.
- B. flow condition occurring in cohesive soils: Quicksand is a flow condition that occurs in cohesionless soils, not cohesive soils.
- C. flow condition occurring in cohesionless soils: This is the correct answer. Quicksand is a flow condition that occurs in cohesionless soils.
- D. flow condition occurring in both cohesive and cohesionless soils: This is not the correct answer. Quicksand is a flow condition that occurs in cohesionless soils, not both cohesive and cohesionless soils.