**Pressure in the Ocean**

The pressure at 10 m below the surface of the ocean is about [tex]2.00 \times 10^5 \, \text{Pa}[/tex].

**Part A: Which of the following statements is true?**

1. The weight of a column of seawater 1 m² in cross-section and 10 m high is about [tex]2.00 \times 10^5 \, \text{N}[/tex].
2. The weight of a column of seawater 1 m² in cross-section and 10 m high plus the weight of a column of air with the same cross-section extending up to the top of the atmosphere is about [tex]2.00 \times 10^5 \, \text{N}[/tex].
3. The weight of 1 m³ of seawater at 10 m below the surface of the ocean is about [tex]2.00 \times 10^5 \, \text{N}[/tex].
4. The density of seawater is about [tex]2.00 \times 10^5[/tex] times the density of air at sea level.

**Part B: Now consider the pressure 20 m below the surface of the ocean. Which of the following statements is true?**

Please provide your answers to both parts.