what is earth?

Question

answer should be unique.

Answer 1

A planet with life on it .



Or



the only planet in the universe to start with E and end with H .



or



Earth is unique , one of it's kind and my answer is a unique one and one of it's kind too .

Answer 2

Earth (IPA: /ˈɜː(r)θ/, often referred to as the Earth, Terra, the World or Planet Earth) is the third planet away from the Sun, and is the fifth largest planet in the solar system. It is also the largest of its planetary system's terrestrial planets, making it the largest solid body in the solar system, and it is the only place in the universe known to humans to support life. It is also the densest planet in the solar system. Widely accepted scientific evidence indicates that the Earth was formed around 4.57 billion years ago[1] and its natural satellite, the Moon, was orbiting it shortly thereafter, around 4.53 billion years ago.

The outer surface is divided into several tectonic plates that gradually migrate across the surface over geologic time spans. The interior of the planet remains active, with a thick layer of convecting yet solid mantle and an iron core that generates a magnetic field. Its atmospheric conditions have been significantly altered by the presence of life forms, which create an ecological balance that modifies the surface conditions. About 71% of the surface is covered in salt-water oceans, and the remainder consists of continents and islands.

There is significant interaction between the Earth and its space environment. The relatively large moon provides ocean tides and has gradually modified the length of the planet's rotation period. A cometary bombardment during the early history of the planet is believed to have played a role in the formation of the oceans. Later, asteroid impacts are understood to have caused significant changes to the surface environment. Long term periodic changes in the orbit of the planet may also be responsible for the ice ages that have covered significant portions of the surface in glacial sheets.

You could get more information from the link below...

Answer 3

From the perspective we get on Earth, our planet appears to be big and sturdy with an endless ocean of air. From space, astronauts often get the impression that the Earth is small with a thin, fragile layer of atmosphere. For a space traveler, the distinguishing Earth features are the blue waters, brown and green land masses and white clouds set against a black background.

Many dream of traveling in space and viewing the wonders of the universe. In reality all of us are space travelers. Our spaceship is the planet Earth, traveling at the speed of 108,000 kilometers (67,000 miles) an hour.

Earth is the 3rd planet from the Sun at a distance of about 150 million kilometers (93.2 million miles). It takes 365.256 days for the Earth to travel around the Sun and 23.9345 hours for the Earth rotate a complete revolution. It has a diameter of 12,756 kilometers (7,973 miles), only a few hundred kilometers larger than that of Venus. Our atmosphere is composed of 78 percent nitrogen, 21 percent oxygen and 1 percent other constituents.

Earth is the only planet in the solar system known to harbor life. Our planet's rapid spin and molten nickel-iron core give rise to an extensive magnetic field, which, along with the atmosphere, shields us from nearly all of the harmful radiation coming from the Sun and other stars. Earth's atmosphere protects us from meteors, most of which burn up before they can strike the surface.

Mass (kg) 5.976e+24
Mass (Earth = 1) 1.0000e+00
Equatorial radius (km) 6,378.14
Equatorial radius (Earth = 1) 1.0000e+00
Mean density (gm/cm^3) 5.515
Mean distance from the Sun (km) 149,600,000
Mean distance from the Sun (Earth = 1) 1.0000
Rotational period (days) 0.99727
Rotational period (hours) 23.9345
Orbital period (days) 365.256
Mean orbital velocity (km/sec) 29.79
Orbital eccentricity 0.0167
Tilt of axis (degrees) 23.45
Orbital inclination (degrees) 0.000
Equatorial escape velocity (km/sec) 11.18
Equatorial surface gravity (m/sec^2) 9.78
Visual geometric albedo 0.37
Mean surface temperature 15°C
Atmospheric pressure (bars) 1.013
Atmospheric composition
Nitrogen 77%
Oxygen 21%
Other 2%

I hope these answers were unique.
Cheers!
VP

Answer 4

Earth, often referred to as the Earth, Terra, the World or Planet Earth) is the third planet away from the Sun, and is the fifth largest planet in the solar system. It is also the largest of its planetary system's terrestrial planets, making it the largest solid body in the solar system, and it is the only place in the universe known to humans to support life. It is also the densest planet in the solar system. Widely accepted scientific evidence indicates that the Earth was formed around 4.57 billion years ago and its natural satellite, the Moon, was orbiting it shortly thereafter, around 4.53 billion years ago.

The outer surface is divided into several tectonic plates that gradually migrate across the surface over geologic time spans. The interior of the planet remains active, with a thick layer of convecting yet solid mantle and an iron core that generates a magnetic field. Its atmospheric conditions have been significantly altered by the presence of life forms, which create an ecological balance that modifies the surface conditions. About 71% of the surface is covered in salt-water oceans, and the remainder consists of continents and islands.

There is significant interaction between the Earth and its space environment. The relatively large moon provides ocean tides and has gradually modified the length of the planet's rotation period. A cometary bombardment during the early history of the planet is believed to have played a role in the formation of the oceans. Later, asteroid impacts are understood to have caused significant changes to the surface environment. Long term periodic changes in the orbit of the planet may also be responsible for the ice ages that have covered significant portions of the surface in glacial sheets.

Shape

The Earth's shape is very close to an oblate spheroid, although the precise shape (the geoid) varies from this by up to 100 meters (327 ft). The average diameter of the reference spheroid is approximately 12,742 km (more roughly, 40,000 km/π). The rotation of the Earth causes the equator to bulge out slightly so that the equatorial diameter is 43 km larger than the pole to pole diameter. The largest local deviations in the rocky surface of the Earth are Mount Everest (8,850 m above local sea level) and the Mariana Trench (10,924 m below local sea level). Hence compared to a perfect ellipsoid, the Earth has a tolerance of about one part in about 584, or 0.17%. For comparison, this is less than the 0.22% tolerance allowed in billiard balls. Because of the bulge, the feature farthest from the center of the Earth is actually Mount Chimborazo in Ecuador.

Chemical composition

The mass of the Earth is approximately 5.98 ×1024 kg. It is composed mostly of iron (35.0%), oxygen (28.0%), silicon (17.0%), magnesium (15.7%), nickel (1.5%), calcium (1.4%) and aluminium (1.4%).

The commoner rock constituents of the Earth's crust are nearly all oxides; chlorine, sulfur and fluorine are the only important exceptions to this and their total amount in any rock is usually much less than 1%. F. W. Clarke has calculated that a little more than 47% of the earth's crust consists of oxygen. It occurs principally in combination as oxides, of which the chief are silica, alumina, iron oxides, lime, magnesia, potash and soda. The silica functions principally as an acid, forming silicates, and all the commonest minerals of igneous rocks are of this nature. From a computation based on 1672 analyses of all kinds of rocks, Clarke arrived at the following as the average percentage composition: SiO2=59.71%, Al2O3=15.41%, CaO=4.90%, MgO=4.36%, Na2O=3.55%, FeO=3.52%, K2O=2.80%, Fe2O3=2.63%, H2O=1.52%, TiO2=0.60%, P2O5=0.22%. These total 99.22%. All the other constituents occur only in very small quantities.

Elevation extremes: (measured relative to sea level)

Lowest point on land: Dead Sea −417 m
Lowest point overall: Challenger Deep of the Mariana Trench in the Pacific Ocean −10,924 m
Highest point: Mount Everest 8,844 m (2005 est.)

Answer 5

Earth (IPA: /ˈɜː(r)θ/), often referred to as the Earth, Tellus, (prefix) tellur- or telluri- or telluro-, Terra, the World or Planet Earth, is the third planet away from the Sun, and is the fifth largest planet in the solar system. It is also the largest of its planetary system's terrestrial planets, making it the largest solid body in the solar system, and it is the only place in the universe known to humans to support life. It is also the densest planet in the solar system. Widely accepted scientific evidence indicates that the Earth was formed around 4.57 billion years ago[1] and its natural satellite, the Moon, was orbiting it shortly thereafter, around 4.53 billion years ago.

The outer surface is divided into several tectonic plates that gradually migrate across the surface over geologic time spans. The interior of the planet remains active, with a thick layer of convecting yet solid mantle and an iron core that generates a magnetic field. Its atmospheric conditions have been significantly altered by the presence of life forms, which create an ecological balance that modifies the surface conditions. About 71% of the surface is covered in salt-water oceans, and the remainder consists of continents and islands.

There is significant interaction between the Earth and its space environment. The relatively large moon provides ocean tides and has gradually modified the length of the planet's rotation period. A cometary bombardment during the early history of the planet is believed to have played a role in the formation of the oceans. Later, asteroid impacts are understood to have caused significant changes to the surface environment. Long term periodic changes in the orbit of the planet may also be responsible for the ice ages that have covered significant portions of the surface in glacial sheets.

Based on the available evidence, current scientists have been able to reconstruct detailed information about the planet's past. Earth formed 4.567 billion years ago out of the solar nebula, along with the Sun and the other planets. Initially molten, the outer layer of the planet cooled when water began accumulating in the atmosphere when the planet was about half its current radius, resulting in the solid crust. The moon formed soon afterwards, possibly as the result of the impact with a Mars-sized object known as Theia. Outgassing and volcanic activity produced the primordial atmosphere; condensing water vapor, augmented by ice delivered by comets, produced the oceans.[6] The highly energetic chemistry is believed to have produced a self-replicating molecule around 4 billion years ago, and half a billion years later, the last common ancestor of all life lived.[7]

The development of photosynthesis allowed the sun's energy to be harvested directly; the resultant oxygen accumulated in the atmosphere and gave rise to the ozone layer. The incorporation of smaller cells within larger ones resulted in the development of complex cells called eukaryotes.[8] Cells within colonies became increasingly specialized, resulting in true multicellular organisms. Aided by the absorption of harmful ultraviolet radiation by the ozone layer, life colonized the surface of Earth.

Over hundreds of millions of years, continents formed and broke up as the surface of Earth continually reshaped itself. The continents have migrated across the surface of the Earth, occasionally combining to form a supercontinent. Roughly 750 million years ago (mya), the earliest known supercontinent Rodinia, began to break apart. The continents later recombined to form Pannotia, 600–540 mya, then finally Pangaea, which broke apart 180 mya.[9]

Since the 1960s, it has been hypothesized that severe glacial action between 750 and 580 mya, during the Neoproterozoic, covered much of the planet in a sheet of ice. This hypothesis has been termed "Snowball Earth", and is of particular interest because it preceded the Cambrian explosion, when multicellular lifeforms began to proliferate.[10]

Since the Cambrian explosion, about 535 mya, there have been five mass extinctions.[11] The last occurred 65 mya, when a meteorite collision probably triggered the extinction of the (non-avian) dinosaurs and other large reptiles, but spared small animals such as mammals, which then resembled shrews. Over the past 65 million years, mammalian life has diversified, and several mya, a small African ape gained the ability to stand upright. This enabled tool use and encouraged communication that provided the nutrition and stimulation needed for a larger brain. The development of agriculture, and then civilization, allowed humans to influence the Earth in a short timespan as no other life form had, affecting both the nature and quantity of other life forms.

Depth Layer
Kilometers Miles
0–60 0–37 Lithosphere (locally varies between 5 and 200 km)
0–35 0–22 ... Crust (locally varies between 5 and 70 km)
35–60 22–37 ... Uppermost part of mantle
35–2890 22–1790 Mantle
100–700 62–435 ... Asthenosphere
2890–5100 1790–3160 Outer core
5100–6378 3160–3954 Inner core

Answer 6

Earth is a planet, unique in itself, as it has all the conditions possible essential for life and thus it can be regarded that earth is a mother planet!!!!!

Answer 7

It is a balloon covered with water on its 3/4 surface and its 1/4 surface is covered with other natural things and atmosphere.

Earth is planet orbiting the sun and all worldly things live on it and a third planet from sun.

Answer 8

It is alive.It is a living sentient thing.Oh it is a planet alright but
the Romans called it Gaius and they were smart enough to understand that it is alive.This does not clash with Christianity.
It regenerates itself and it regulates and controls the weather and the seasons.What we are seeing now is how it deals with a species that places too great a demand on its resources.We will regulate our behavior or it will do it for us.If you are talking about soil remember this planet creates it.

Answer 9

Earth refers either to the third planet orbiting our sun, and the world we live on, or sometimes it refers to the dirt or other material that covers this planet's solid surface.

Answer 10

EARTH IS THE THIRD PLANET OF SOLAR SYSTEM WHICH ROTATES ROUND ITS IN AXIS AT AN ANGLE 23.5DEGREE ONCE IN EVERY 24 HRS AND REVOLVES AROUND THE SUN ONCE IN EVERY 365.25 DAYS