What kind of vicissitudes has the earth experience

Earth is the third planet from the sun and the only celestial body known to harbor and support life. About 29.2% of the Earth's surface is landmass consisting of continents and islands. The remaining 70.8% is covered by water, mostly by oceans, bays and other salt water bodies, but also by lakes, rivers and other fresh water bodies, which together make up the hydrosphere. Most of the Earth's polar regions are covered in ice