How do you know that the earth is covered with water?

Answer 1

because if you look at a globe the earth is not only covered in

water but also land where we live in.......

hope this has helped you : )

Answer 2

Scientists have used various methods, including satellite observations and direct measurements, to estimate that Earth's surface is approximately 71% covered by water. This calculation takes into account the vast oceans, seas, lakes, rivers, and ice caps that make up Earth's water bodies.