Erosion
I don't really know what you define as an underwater cave. Some caves have been drowned by rising sea-level, having formed on land at times of lower sea-levels (i.e. during the Ice Age glacials). Others are entirely terrestrial but full in whole or in part with water. Nevertheless, the answer is that normally caves carry water from limestone uplands to their outlet (risings or springs) at lower altitude, so their effect is to replace open streams on the surface with underground ones.Other than that or the occasional collapse of a cave roof to create a doline on the ground above, they don't affect the land surface.
Approximately 97% of the Earth's surface is covered by salt water.
Water makes up about seventy five percent of the Earth's surface.
The all the water on Earth's surface is known as the hydrosphere. This includes water in oceans, rivers, lakes, and ice caps.
Groundwater can create certain features on the Earth's surface through erosion and deposition. The slow movement of groundwater can dissolve and carry away rock material, creating caves, sinkholes, and caverns. When groundwater deposits minerals as it flows through the ground, it can form features like stalactites and stalagmites in caves.
it is water cycle
70% or 80% of water covers the earths surface
soften the surface and create earthquakes. another version of the grand canyon
3/4 of the earth's surface is water.
69%
about 30%
the sun
Water.
Ground water.
the water cycle
71.13% of the earth is covered by water. Only 3% of that water is fresh water, the rest is salt water.
Roughly 71% of Earth is covered by water and because that is well over half there is more water than land on Earths surface