Earth, our home planet, is a world unlike any other. (Table 8o-1)", "Global average temperature may hit record level in 2010", "Trends in Atmospheric Carbon Dioxide: Recent Global CO, National Oceanic and Atmospheric Administration, "The age of the Earth in the twentieth century- a problem (mostly) solved", "Rover reveals Mars was once wet enough for life", Exploring the water cycle of the Blue Planet. Short Essay on Earth (290 Words) The Earth was formed about 4.7 billion years ago. Now, 70% of all people do not live in Africa but in Europe and Asia.[62]. Much like a greenhouse, this blanket of gases absorbs and retains heat. [49] There are three groups of rocks that make up most of the Earth's crust. [31], Because of its water, Earth is home to millions of species of plants and animals. Earth's atmosphere is 78 percent nitrogen, 21 percent oxygen, and one percent other gases such as carbon dioxide, water vapor, and argon. The deepest hole ever dug is only about 12.3 kilometers or 7.6 miles. The air animals and plants use to live is only the first level of the air around the Earth (the troposphere). The air is mostly made of nitrogen (about 78%) and oxygen (about 21%) but there are a few other gasses as well. They are thicker where there is land, between 30 to 50 km or 19 to 31 mi thick. It is, therefore, called a blue planet. [30] About 74% of the surface of Earth is covered by liquid or frozen water. [4] To make up this extra bit of a day every year, an additional day is used every four years. Find out the origins of our home planet and some of the key ingredients that help make this blue speck in space a unique global ecosystem. The 1.2% left over is made of many different kinds of other chemicals. It moves on its orbit at an average speed of about 30 km/s (19 mi/s). This teardrop-shaped field shields Earth from high-energy particles launched at us from the sun and elsewhere in the cosmos. Most of the ways people create electric power use burning kinds of carbon—especially coal, oil, and natural gas. All rights reserved. Even though air seems very light, the weight of all of the air above the outside of the Earth (air pressure) is important. [59] Most living things need the air (or parts of the air gripped in the water) to breathe and live. A cover of gases surrounding the earth is called the earth’s atmosphere or simply as atmosphere. Much later, there was a time (the Cryogenian) when Earth was almost entirely covered by thick ice sheets (glaciers). 1911. Like Venus and Mars, Earth has mountains, valleys, and volcanoes. The living part of Earth's surface is called the "biosphere". Thanks to instruments such as NASA's Kepler Space Telescope, astronomers have found more than 3,800 planets orbiting other stars, some of which are about the size of Earth, and a handful of which orbit in the zones around their stars that are just the right temperature to be potentially habitable. With a radius of 3,959 miles, Earth is the fifth largest planet in our solar system, and it's the only one known for sure to have liquid water on its surface. People change the Earth in many ways. The inner core is surrounded by the outer core, a 1,400-mile-thick band of iron and nickel fluids. Earth is also unique in terms of monikers. "Petrology" in the, damages rocks in high places and breaks them into small pieces, Cold air becomes thicker and falls, and warm air becomes thinner and goes up, "Geoid, Topography and Distribution of Landforms", "General Definitions and Numerical Standards", "Surface area of our planet covered by oceans and continents. Ninety percent of Earth's atmosphere lies within just 10 miles of the planet's surface. [41] This is discussed as the Snowball Earth theory.[41]. It keeps life on earth in danger. It is about 10,971 metres or 35,994 feet below sea level,[48] but, again, there are probably places at the bottom of the Arctic Ocean that are nearer to the center of the Earth. [51] The thin level of hard rock on the outside of the Earth rests on hot liquid material below it in the deeper mantle. Because of this, people sometimes call it the blue planet. This is what makes the Earth magnetic. Earth goes around the Sun once (one year) for every 365​1⁄4 times it turns around (one day). The five countries with the most people are China, India, the United States, Indonesia, and Brazil. The shape is called an oblate spheroid. When plates of continental crust collide, mountain ranges such as the Himalaya are pushed toward the skies. There are high places called mountains, and high flat places called plateaus. Cold air becomes thicker and falls, and warm air becomes thinner and goes up. Earth and the other planets formed about 4.6 billion years ago. Earth is a terrestrial planet. Because of its velocity, Earth has a slight bulge at the Equator. The Earth's crust is solid but made of parts which move very slowly. On average, Earth's surface temperature is about 57 degrees Fahrenheit; without our atmosphere, it'd be zero degrees. Earth, our home planet, is a world unlike any other. It takes about 27​1⁄3 days for the Moon to go all the way around Earth, but because Earth is moving around the Sun at the same time, it takes about 29​1⁄2 days for the Moon to go from dark to bright to dark again. The earliest known supercontinent was called Vaalbara. But about 99% of the atmospheric air is present without 40 km from the earth’s surface. It is locked to Earth, so that it always has the same half facing Earth; the other half is called the "dark side of the moon". But for all that our atmosphere does, it's surprisingly thin. See: Due to natural fluctuations, ambiguities surrounding. This oxygen also formed the ozone layer which protects Earth's surface from bad ultraviolet radiation from the Sun. Chemical composition of Earth, Venus, and Mercury. The other three are Mercury, Venus, and Mars. Small and simple kinds of life can live far under the surface, but animals and plants only live on the surface or in the seas. It is the only planet known to have life on it. Chisholm, Hugh (editor). The Earth formed around 4.5 billion years ago. They use the gasses—especially oxygen and carbon dioxide—to make and use sugar and to give themselves power. This gives the warm liquid rock inside the earth a place to come out. All places on Earth are made of, or are on top of, rocks. NASA alone has dozens of missions dedicated to solving our planet's mysteries. The equator, around the middle of Earth's surface, is about 40,075 kilometers or 24,900 miles long.[44]. [53] Two plates can move away from each other ("divergent" plate edges). Since people have grown used to the heat we have now, though, we do not want the Earth to be too much warmer or colder. People found useful animals and bred them so they were easier to keep. Short essay on the Motions of the Earth Short essay on the Latitudes and Longitudes Brief notes on … [42] The Earth's crust is largely oxygen (47%). Earth is the only planet in the Solar System that has a large amount of liquid water. It is the only planet known to have life on it. Earth is the only planet known to maintain life. This page was last changed on 28 November 2020, at 01:38. Scientists think that people originally came from Africa. Without the air, the damage meteorites do would be much greater. [52] This liquid material moves because it gets heat from the hot center of the earth. Rain and storms are both in this level. The fundamental cause of the differences in the Earth's surface is plate tectonics. This level has a special kind of oxygen called ozone. From the outer space, the earth appears blue because its 2/3rds surface is covered by water. Chemicals that are very uncommon (such as gold and platinum) can be very valuable. This solid middle part (the inner core) is almost all iron. Scientists believe that parts of both planets broke off — becoming (by gravity) the Moon.[39].
2020 short note on earth