Depression increases your risk of a number of diseases and other conditions by, for example, increasing levels of stress hormones such as cortisol or adrenaline. Depression can affect the immune system, making it harder for your body to fight infection. Vaccinations are even less effective in people with depression.
The total surface area of the Earth is about 7008510000000000000â 510 million km2 (197 million sq mi). Of this, 70.8%, or 7008361130000000000â 361.13 million km2 (139.43 million sq mi), is below sea level and covered by ocean water.
Confidence votes 40. Surface Area of Earth: 510,072,000 square kilometres (total) or 200,000,000 (two hundred million) square miles. 149,000,000 square kilometres (land only). 510,065,600 km2 (see related link) of which 148,939,100 km2 (29.2 %) is land and 361,126,400 km2 (70.8 %) is water.