• It was first discovered in 1774 by Joseph Priestly.
• Oxygen can bond with nearly all metals. The rusting of iron can be given as an example of the activity called oxidization.
• Fire is lit thanks to oxygen. The reason that there is no fire in space is that oxygen is almost non-existing.
• 21% of air, 88,8% of water and 50% of the Earth's crust is composed of oxygen.
• The ratio of oxygen in air is at a sensitive balance to meet the needs of all living things.
• The flawless balance in the atmosphere is protected thanks to living things.
• All living things, including human beings, produce carbon dioxide, which is poisonous for them, while they use the oxygen they need.
• Plants do the opposite and turn the poisonous carbon dioxide into oxygen.
• If all living things produced oxygen like plants, the ratio of oxygen would increase too much and the atmosphere would become a bomb ready to explode.
• Every 1% rise in the level of oxygen in the atmosphere increases the possibility of igniting a fire on Earth by 70%.
• If plants consumed oxygen and released carbon dioxide, like other living things, some time later fresh air would cease and all living things would die by suffocation.
• A normal person can only endure a lack of oxygen for approximately four minutes.
• We need oxygen to accomplish our bodily functions.
• Every time we breathe, we fill our lungs with oxygen and it is carried to our cells through the blood.
• The carried oxygen is used to produce energy inside the 1 billion factories forming our body, meaning our cells.
Venus
• It is the second closest planet to the Sun in our solar system.
• Because it resembles the Earth in terms of its size, location and volume, it is referred to as the Earth’s twin by scientists.
• It turns in the opposite of the Earth’s direction around the Sun.
• For Venus, one day equals 243 Earth days; this shows that Venus rotates on its axis much slower than the Earth.
• Venus’ orbit around the Sun lasts 225 days.
• The planet’s orbit around itself takes longer than its orbit around the Sun. This means that its day is longer than a year.
• Its atmosphere is filled with clouds loaded with sulfuric acid. Its air is so poisonous that no being can breathe there.
• Its surface is covered with mountains, canyons and valleys. However there is not even a single drop of water on the surface.
• The reason that there is no water is that the temperature on the planet’s surface is too high for any being to survive; the planet’s temperature is 470˚Celsius. Venus, which has volcanic explosions on its surface, is the hottest planet in the solar system.
• The reason for this high temperature is that the planet is shrouded in thick clouds, imprisoning the heat coming from the sun.
• It is the brightest and biggest star when seen from the Earth.
• What gives it this brightness is that the clouds enveloping the planet reflect sunlight very strongly.
• The atmospheric pressure on Venus’ surface is 90 times that of the Earth.
• It has been observed that sand dunes and sand structures on its surface are formed through winds and storms.
• The craters on the surface are at least 1.5 to 2 kilometers on average because any small meteorites burn up and are destroyed in the atmosphere before even reaching to the surface.
• Venus is created with qualities totally unsuitable for any life at all.
