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.
Surface Area of the Earth. by Jerry Coffey on February 18, 2009. The surface area of the Earth is 510 million square kilometers or 5.1Ã10 8 km 2. The Earth is a water heavy planet, so, if you break its surface area into water and land segments, it would look like this: land 149 million km 2, water 361 million km 2. Letâs look at how the surface area of the Earth compares to the surface area of the other planets in our Solar System and our Moon.