(1) It is conjectured that the effect of pressure may not only be related to the size of the pressure, but also may be related to the size of the force-bearing area.

(2) Verify the conjecture ①: When studying that the effect of pressure may be related to the size of the pressure, it is necessary to control the size of the stressed area to be the same, change the size of the pressure, and compare the effect of the pressure. The specific method is: pave the beach, put it in a mineral water bottle

Fill half a bottle of sea water or sand into the mineral water bottle and place it upright on the beach; then fill a full bottle of sea water or sand into the mineral water bottle and place it upright on the beach. Observe and compare the depth of the beach depression in the two situations.

Verification of conjecture ②: When verifying that the effect of pressure may be related to the size of the force-bearing area, it is necessary to control the size of the pressure unchanged, change the size of the force-bearing area, and compare the effect of the pressure. The specific method is: smooth the beach, and

Put an appropriate amount of seawater or sand into a mineral water bottle, screw the lid on and place it upside down or upright on the beach. Observe the depth of the beach depression when placing it in two different ways.

(3) The effect of pressure is related to the size of pressure and the force-bearing area, so the recording form should be designed to take into account the effect of pressure, the size of pressure, and the force-bearing area.

Recording form for verifying conjecture ②: Method The degree of dent in the sand surface Conclusion The bottom of the bottle is facing down (upright) The bottle cap is facing down (upside down) (4) According to the experimental process, it can be seen that exploration includes the following elements of inquiry: asking questions and making conjectures

, design and conduct experiments, collect data, and draw experimental conclusions.

Therefore, the answer is: (1) ② The effect of pressure may be related to the size of the force-bearing area.

(2) ① Pave the beach, put half a bottle of seawater or sand into a mineral water bottle, and place it upright on the beach; then fill a full bottle of seawater or sand into a mineral water bottle, and place it upright on the beach.

Observe and compare the depression depth of the beach in the two situations.

②Pave the beach, put an appropriate amount of seawater or sand into the mineral water bottle, screw the lid on, and place it upside down or upright on the beach. Observe the depth of the beach depression when placing it in two different ways.

(3) The table is as shown above; (4) Ask questions, make conjectures, design and conduct experiments.