Final answer:
The statement that the ocean floor changes due to the movement of continents is accurate. The Atlantic Ocean's floor expands by 25 km² each century as the mid-Atlantic Rift causes Europe and North America to drift apart by about 5 meters over the same time period.
Step-by-step explanation:
Among the provided statements about the land under Earth’s oceans, I agree with the statement: B) The ocean floor changes when continents move closer together or farther apart. Additionally, statement C is also correct in that the ocean floor changes every day as tectonic plates move. To understand this concept further, we can calculate the area of new ocean floor being created due to the separation of continents.
For instance, Europe and North America are moving apart by about 5 meters per century. With the mid-Atlantic Rift being 5000 km long, we can calculate the area of new ocean floor created each century. Using the formula for area (length × width), the total area of new ocean floor is 5 m × 5000 km × 1000 m/km = 25,000,000 m² or 25 km² per century.