The only place in the universe where we know for certain that there is life is Earth. Our solar system was formed from a swirling cloud of gas and dust that formed Earth over 4.5 billion years ago. Scientists theorize that the gas and dust collapsed into a disk, with different parts of it hitting each of the planets in the solar system.
Our planet is in a small corner of the Milky Way, 25,000 light-years from the center. The solar system is located on a small arm called the Orion Spur, which is the branch off of the Sagittarius Arm.
Earth is the largest rocky planet in the solar system, with a diameter of 40,075 kilometers.
Oxygen, magnesium, iron, aluminum and nickel are some of the elements that make up Earth. According to the U.S. Geological Survey (USGS), our planet has a thin outer layer of mostly silicate and basaltic rocks. The next layer down is the mantle, which is about 2,900 km below the surface. Most of the rock in the mantle is in a thick form that takes millions of years for its movement to become apparent, so it's a misconception that all the rock in the mantle is melted into magma. The center of Earth is a nickel-iron core that is liquid on the outside, but is crushed by incredible pressures into a solid form at the lowest depths.
There are several large landforms on Earth. According to the Encyclopedia of World Geography, the largest continent is called Afro-Eurasia, which has a total area of over 8 million square miles. According to the online encyclopedia Nations Online, North and South America comprise 42 million square miles, while the frozen continent of Antarctica is 14 million square miles. According to the Australian government, the area of Australia is 7 million square miles.
The processes below Earth cause the continents to move. Underground continents may be as old as Earth itself, because nobody knows how or when they formed.
NASA says our planet has an atmosphere of 80% nitrogen, 20% oxygen, 0.9% argon and 0.04% carbon dioxide. NASA says that most human activity takes place in the lowest atmospheric layer, the troposphere. Clouds and weather balloons fly up to 31 miles (50 km) above the ground. The mesosphere extends up to 85 km in altitude and the thermoosphere is at least 373 miles high.
Climate and weather are affected by human activity. The human industry is heating up our planet by adding excess carbon dioxide. In June 2020 the temperature in the town of Verkhoyansk in the northern part of Russia hit 100 F, making it the hottest town in the world.
Earth is tilted by 23.4 degrees, meaning that sunlight falls on the planet differently over the course of the year. The polar regions in the north and south of the planet are the polar regions, while the middle temperate zones are between 23 and 66 degrees latitude north.
The peak of Mount Everest is the tallest point above sea level. The deepest spot on our planet is a crescent-shaped trough at the bottom of the western Pacific Ocean.
The longest river in the world is the Nile, which goes through northeastern Africa. The largest freshwater lake in the world, Lake Baikal in Russia, has a volume equivalent to all five Great Lakes combined.
Earth is the only place in the universe where life exists. Live Science reported that some of the oldest evidence of life on the planet suggests that it was already widespread. Many theories have been proposed as to how these tiny creatures came to be.
Scientists estimate that there are as many as 1 trillion species on our planet, occupying niches that extend from the upper atmosphere to deep below the rocky surface. Live Science has previously reported that there are bizarre and complex biospheres in every rock and crevice that has ever been explored. The diversity of life on Earth has given scientists hope that life might exist in extreme environments throughout the universe, but whether this means organisms exist elsewhere in the solar system or beyond remains an open question.
Bishop, B. C. There is a mountain called Mount Everest. There is a place called Mount-Everest on thebritannica.com.
The Caltech is a center for analyzing and processing IR. What is the planet made of? It was cool. The question "What is Earth-made-of" was asked on March 25, 2022.
Geoscience Australia. The area of Australia is states and territories. Australian government The area of Australia states and territories was reported on March 25, 2022.
R. W. was the author. The year 2005. There is an encyclopedia of world geography. There are facts on file.
NASA. There was a movie about (1976). The U.S. Standard Atmosphere was published in 1976. There is a NASA Technical Reports server.
NASA has a space flight center. The year ended in December. The stars of the Milky Way.
The National Oceanic and Atmospheric Administration. Teacher background information: Earth's climate.
Nations Online. There are countries in the Americas. On March 25, 2022, from www.nationsonline.org/oneworld/america.htm
E. C. Robertson was born on January 14, 2011. The Earth's interior. The U.S. Geological Survey has a website.
T Sharp was born on July 6. How big is the planet? Space.com has a video on how big is earth.
Sharp, T., and Urrutia, D. E. How far from the sun is Earth? How far is earth from the sun?
H. Zell was published on August 7. Earth has atmospheric layers. There is a mission page on NASA.
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