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.
Well, here are some numbers to make you think again! The circumference of the Earth is about 40,000 kilometers or 24,900 miles. This refers to how big the Earth is around itâs fattest middle part, like if you were to measure the length of a string going around the center of the Earth at the equator.he total surface area of the Earth is about 500,000,000 square kilometers. âSurface areaâ refers to all of the area of the lands surface, such as oceans and continents. Itâs sort of like the total amount of space on the Earth that you could walk on or swim through.