Namely, the large amount of free diatomic oxygen is maintained through solar energy by the Earth's plants, and without the plants supplying it, the oxygen in the atmosphere will over geological timescales combine with material from the surface of the Earth. The solid inner core is too hot to hold a permanent magnetic field but acts to stabilise the magnetic field generated by the liquid outer core. The natural satellites orbiting other planets are called "moons", after Earth's Moon. The four main layers of the Earth are the crust, mantle, outer core, and the inner core. With the hustle and bustle of everyday life, it is easy to forget that the human family lives on a small blue planet named Earth. It is about 2900 km thick and is separated into the upper and lower mantle. Note: 70.8 % of the world's surface is covered by water, 29.2 % is exposed land, Land boundaries: the land boundaries in the world total 251,480 km (not counting shared boundaries twice). It is also difficult to determine the exact age of the oldest rocks on Earth, exposed at the surface, as they are aggregates of minerals of possibly different ages. The outer core is 2300 km thick and the inner core is 1200 km thick. This comprises the continents and ocean basins. The ozone, too, can only be produced in an atmosphere with a large amount of free diatomic oxygen, and so also is dependent on the biosphere.
The lower portion of the stratosphere has a nearly constant temperature with height but in the upper portion, the temperature increases with altitude because of absorption of sunlight by ozone. :), Hello Cat, so true. I'm 11 and Im in 6th grade and i'm using this 4 a project, i read all of this and it was great i am happy i read this because it gives me enough information for my project im only 11 years old in the 5th grade thankyou for all the information, yes that's very good but i didn't read but i read all of them's comment and i am a 9 years old kid. The magnetosphere also shields the ionosphere from direct scouring by the solar wind. Glad it was helpful! The crust has a variable thickness, being 35-70 km thick in the continents and 5-10 km thick in the ocean basins. Ps. The Earth is approximately a slightly oblate spheroid (ellipsoid having a shorter axis and two equal longer axes), with an average diameter of approximately 12,742 km. Earth, also known as theEarth or Terra. During Earth’s early formation, the planet underwent a period of differentiation that allowed the heaviest elements to sink to the center and lighter ones to rise to the surface. The crust ranges from 5 to 70 km in depth.
Since the equator receives more sunlight than the poles, climate varies depending on the distance from the equator. (cause i cant put down livingsta). National Geographic Kids is an exciting monthly read for planet-passionate boys and girls, aged 6-13! The impact generated a vapor cloud, which was mostly composed of silicate, and that became the moon. The outermost layer of the Earth is the crust. http://www.spacedaily.com/news/water-99l.html. Following the scientific revolution and the development of radiometric age dating, measurements of lead in uranium-rich minerals showed that some were in excess of a billion years old. Glad it was useful! But anyway, thank you for passing by and reading, all was good for me but waste of time for ms livingsta. The layers, troposphere, stratosphere, mesosphere, thermosphere, and the exosphere vary around the globe and in response to seasonal changes. It starts a mere 30 kilometers (18.6 miles) beneath the surface. However, we can also think about the climate of an entire planet. The Ozone Layer: The stratosphere contains a thin layer of ozone which absorbs most of the harmful ultraviolet radiation from the Sun. Ca-Al-rich inclusions (inclusions rich in calcium and aluminium), the oldest known solid constituents within meteorites that are formed within the solar system, are 4.567 billion years old, giving an age for the solar system and an upper limit for the age of Earth. Thanks. The planet's life forms are sometimes said to form a "biosphere." This layer allows the solid lithosphere to move around since the asthenosphere is much weaker than the lithosphere. To describe the regional climate of a place, people often tell what the temperatures are like over the seasons, how windy it is, and how much rain or snow falls. livingsta (author) from United Kingdom on October 07, 2013: Hi Princess thank you, I am glad that you find this interesting and informative! Hot summer days may be quite typical of climates in many regions of the world, but global warming is causing Earth's average global temperature to increase. Earth has one natural satellite, the Moon, which orbits around Earth every 27 1/3 days. The thermosphere extends from 80 km above the Earth's surface to outer space. This is the layer of the atmosphere closest to the Earth's surface, extending up to about 10-15 km above the Earth's surface. The average density of Earth is 5515 kg/m3, making it the densest planet in the Solar system. The planet formed around 4.57 billion (4.57×109) years ago and shortly thereafter acquired its single natural satellite, the Moon.
The names of these layers, in order of … All around us we see trees, animals, cars, buildings, farms, factories, stores, and other natural and man-made structures. The crust has a variable thickness, being 35-70 km thick in the continents and 5-10 km thick in the ocean basins. livingsta (author) from United Kingdom on March 30, 2012: Thank you for the appreciation JP, am glad it is useful !
Our Earth is warming more quickly than it has in the past according to the research of scientists.
All the best! Its dominant species is the human (Homo sapiens). On land, biomes are separated primarily by latitude. Near its upper edges, somewhere between about 100 and 200 kilometers (62 to 124 miles) underground, the mantle’s temperature reaches the melting point of rock. This age has been determined by radiometric age dating of meteorite material and is consistent with the ages of the oldest-known terrestrial and lunar samples.
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