Поиск

Полнотекстовый поиск:
Где искать:
везде
только в названии
только в тексте
Выводить:
описание
слова в тексте
только заголовок

Рекомендуем ознакомиться

Остальные работы->Реферат
Cyanobacteria is any of a large, heterogeneous group of prokaryotic, principally photosynthetic organisms. Cyanobacteria resemble the eukaryotic algae...полностью>>
Остальные работы->Реферат
Female genital mutilation (FGM) is referred to as the removal of part, or all, of the female genitalia. The most severe form is infibulation, otherwis...полностью>>
Остальные работы->Реферат
Halachikally the Torah Law we follow today is according to the School of Hillel. The School of Hillel and the School of Shami were so far apart that t...полностью>>
Остальные работы->Реферат
Throughout 476 A.D. to 1350 A.D. the Middle Ages reigned. Life was about that one code. The Code of Chivalry. Chivalry, the order of knighthood and es...полностью>>

Главная > Реферат >Остальные работы

Сохрани ссылку в одной из сетей:

The Earth Essay, Research Paper

Did u know that our planet, Earth wasn?t always thought of as a planet? Until the sixteenth century when Capernicus figured out that the Earth was another planet, which revolved around the sun, Greek astronomers thought the Earth was the center of the solar system. Also Earth is the only planet that its name didn?t come from Greek/Roman mythology.

When earth was first discovered, astronomers were only able to study it with out spacecraft. It was not until the twentieth century that we had maps of the entire planet. Pictures taken of the planet are very important, not only because they aid in weather predictions, but they are also very beautiful.

The Earth is divided into seven layers: the crust, upper mantle, transition region, lower mantle, D? layer, outer core, and inner core. ?The crust varies considerably in thickness; it is thinner under the oceans, and thicker under the continents?. (Arnett1) The inner core and crust are solid, and the outer core and mantel layers are plastic or semi-fluid. Most of Earth?s mass is in its mantle and the rest is in its core.

Most of the core is made of iron, but there may be lighter elements in it too. Temperatures at the center of the core can be as high as 7500K, which is hotter than the surface of the sun.

?Unlike the other rocky planets, Earth?s crust is divided into several separate plates, which float around independently on top of the hot mantle below?. (Arnett1) This is called the plate tectonics theory. This is created by two processes. The first is spreading which occurs when two plates move away form each other and magma gets in, creating a new crust. The second is subduction, which is the opposite. When this happens two plates collide and one ends up being destroyed in the mantle. There are eight major plates: The North American Plate, South American Plate, Antarctic Plate, Eurasian Plate, African Plate, Indian-Australian Plate, Nazca Plate, and Pacific Plate. Other than these plates are about twenty small plates.

The surface of the Earth is about 4.5 ~ 4.6 billion years old, although the oldest rocks are about 4 billion years old. This is said to be rare because they are older then 3 billion years old.

Water makes up 71 percent of the Earth?s surface. Earth is also the only planet that can have water as a liquid on its surface. Water is very important on Earth because we need it to live, and without it we would be non-existent.

The Earth?s atmosphere is made up mostly of nitrogen and oxygen, but also has argon, carbon dioxide, and water. The reason there isn?t as much carbon dioxide in the Earth today is because it has turned into carbonate rocks, was dissolved into the oceans, and consumed by living plants. The carbon dioxide that remains is very important for the Earth?s surface temperature via the greenhouse effect. ?The greenhouse effect raised the average surface temperature about 35 degrees C above what it would otherwise be (form a frigid -21C to a comfortable +14C); without it the oceans would freeze and life as we know would be impossible?. (Arnett1)

The free oxygen on Earth is outstanding. Oxygen is good because under normal circumstances it could combine in a quick manner with other elements. If we were not in existence then free oxygen wouldn?t be either.

The electric currents in the core produce Earth?s magnetic field. When the Earth?s magnetic field and upper atmosphere interact with the solar wind an auroras takes place. An aurora is a glow in a planet?s ionosphere caused by the planet?s magnetic field and charged particles form the sun. ?The Earth?s magnetic field and its interaction with the solar wind also produce the Van Allen radiation belts, a pair of doughnut shaped rings of ionized gas (or plasma) trapped in orbit around the Earth.

The Earth?s satellite, the moon, is its only natural satellite, but placed in orbit around the Earth are thousands of small artificial satellites.

From this report I have learned many facts about the Earth that I didn?t know before. I hope to learn as much about the other planets as I did about Earth.


Загрузить файл

Похожие страницы:

  1. History Of The Earth Essay Research Paper

    Реферат >> Остальные работы
    History Of The Earth Essay, Research Paper During the past billion years, the Earth’s climate has changed from warm ... periods to cold periods where the Earth was covered with many huge ... , but it did not last long. After the brief warming, the temperatures fell ...
  2. Giants In The Earth Essay Research Paper

    Реферат >> Остальные работы
    ... The Earth Essay, Research Paper O.E. R lvaag s thesis in the novel Giants in the Earthis well hidden throughout the ... wood up on the copping block; everyone did their part in ... in the Earth. These include: In Those Days,The Emigrants, and Founding the Kingdom ...
  3. The Dream Essay Research Paper The DreamFinal

    Реферат >> Остальные работы
    The Dream Essay, Research Paper The Dream Final Paper Praxis I Sahna Carmona It was late December, the drifts ... and perhaps judgmental, but he did succeed in raising responsible children ... I was falling to the center of the earth and out the other side. I had ...
  4. The Crucible Essay Research Paper ARTHUR MILLER (2)

    Реферат >> Остальные работы
    The Crucible Essay, Research Paper ARTHUR MILLER: THE AUTHOR AND HIS TIMES In ... did he let the wolves into the fold, he joined in the attack. Now the ... establishing God’s “visible Kingdome” on earththe state was to be governed ...
  5. Earth Essay Research Paper EARTHThe Earth man

    Реферат >> Остальные работы
    Earth Essay, Research Paper EARTH The Earth, man’s home, is a planet. The Earth has special characteristics, and these ... very harmful, and, if the atmosphere did not filter it out, probably ... none of the life forms on Earth ...

Хочу больше похожих работ...

Generated in 0.0027151107788086