What percentage of Earth's surface is covered by water?

The correct choice indicates that approximately 71% of Earth's surface is covered by water. This figure is significant because it highlights the predominance of oceans and other bodies of water on our planet, which play crucial roles in global climate regulation, weather patterns, and the water cycle. Understanding the vastness of water coverage is fundamental in the study of earth sciences, particularly in areas related to plate tectonics and geological processes. The oceans act as a critical component in tectonic activity, influencing aspects like subduction zones and mid-ocean ridges, where much of the planet's geological activity occurs.

The other options reflect incorrect percentages that do not accurately represent the proportion of water on Earth's surface, emphasizing the importance of recognizing credible scientific data. This understanding also helps in addressing environmental concerns, such as the impact of climate change on sea levels and marine ecosystems.