With reference to the permeability and porosity of chalk and clay, consider the following statements:

1. Chalk is both porous and permeable, allowing water to pass through it relatively easily.

2. Clay is porous but largely impermeable, so it holds water rather than letting it pass through.

3. Because of this, clay layers often act as an aquiclude (a barrier that traps groundwater above them).

Which of the statements given above are correct?