While our knowledge about exoplanets has increased significantly in the past few years, it has also led to newer proposals on how our planet came into existence. The theory in the article has not yet been proven but it is an interesting read and once again makes us realize as to how science works.
Yes and no.
Yes: About 70 percent of the earth's surface is normally covered by water.
No: The Earth's solid components are many times larger than the small amount of water (liquid, ice, fresh water, salt water) on Earth. In this illustration, you can see the tiny (!) ~860-mile diameter sphere that all the Earth's water comprises, compared to the Earth.... (more)