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.
The land surface of the Earth is between 29% and 30% of the total area, depending on the definition of the terms land and water.The best estimate is about 149 million km2 o â¦ f the total of about 510 million km2, which is 29.2%. (57.5 million square miles out of 196.9 million square miles).he area of Africa is about 30.2 million kmÂ² (11.7 million sq miles) This means it covers 6% of the Earth's total surface area and 20.4% of the total land area. 9 people found this useful.