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.
200,000,000 million (two hundred million) square miles. If we approximate the earth as a smooth sphere with a radius of 3,959 miles, then its surface area is 1.9696 x 108 â¦ square miles. (rounded) Two hundred million is an easy way to remember it.