explain about the 6 feature about the earth name them. give correct answer plz.
Answers
Answer:
Earth is the third planet from the Sun and the only astronomical object known to harbor life. According to radiometric dating estimation and other evidence, Earth formed over 4.5 billion years ago. Earth's gravity interacts with other objects in space, especially the Sun and the Moon, which is Earth's only natural satellite. Earth orbits around the Sun in 365.256 solar days, a period known as an Earth sidereal year. During this time, Earth rotates about its axis 366.256 times, that is, a sidereal year has 366.256 sidereal days.[n 6]
Earth
Astronomical symbol of Earth
"The Blue Marble" photograph of Earth, taken by the Apollo 17 mission. The Arabian peninsula, Africa and Madagascar lie in the upper half of the disc, whereas Antarctica is at the bottom.
The Blue Marble, the first full-view photograph of the planet, was taken by Apollo 17 astronauts en route to the Moon in 1972
Designations
Alternative names
Terra, Tellus, Gaia, Gaea, the World, the Globe
Adjectives
Earthly, terrestrial, terran, tellurian
Orbital characteristics
Epoch J2000[n 1]
Aphelion
152100000 km[n 2]
(94500000 mi)
Perihelion
147095000 km[n 2]
(91401000 mi)
Semi-major axis
149598023 km[1]
(92955902 mi)
Eccentricity
0.0167086[1]
Orbital period
365.256363004 d[2]
(31558149.7635 s)
Average orbital speed
29.78 km/s[3]
(107200 km/h; 66600 mph)
Mean anomaly
358.617°
Inclination
7.155° to the Sun's equator;
1.57869°[4] to invariable plane;
0.00005° to J2000 ecliptic
Longitude of ascending node
−11.26064°[3] to J2000 ecliptic
Argument of perihelion
114.20783°[3]
Satellites
1 natural satellite: the Moon
5 quasi-satellites
>1 800 operational artificial satellites[5]
>16 000 space debris[n 3]
Physical characteristics
Mean radius
6371.0 km (3958.8 mi)[6]
Equatorial radius
6378.1 km (3963.2 mi)[7][8]
Polar radius
6356.8 km (3949.9 mi)[9]
Flattening
0.0033528[10]
1/298.257222101 (ETRS89)
Circumference
40075.017 km equatorial (24901.461 mi)[8]
40007.86 km meridional (24859.73 mi)[11][n 4]
Surface area
510072000 km2 (196940000 sq mi)[12][13][n 5]
148940000 km2 land (57510000 sq mi; 29.2%)
361132000 km2 water (139434000 sq mi; 70.8%)
Volume
1.08321×1012 km3 (2.59876×1011 cu mi)[3]
Mass
5.97237×1024 kg (1.31668×1025 lb)[14]
(3.0×10−6 M☉)
Mean density
5.514 g/cm3 (0.1992 lb/cu in)[3]
Surface gravity
9.80665 m/s2 (1 g; 32.1740 ft/s2)[15]
Moment of inertia factor
0.3307[16]
Escape velocity
11.186 km/s[3]
(40270 km/h; 25020 mph)
Sidereal rotation period
0.99726968 d[17]
(23h 56m 4.100s)
Equatorial rotation velocity
0.4651 km/s[18]
(1674.4 km/h; 1040.4 mph)
Axial tilt
23.4392811°[2]
Albedo
0.367 geometric[3]
0.306 Bond[3]
Surface temp. min mean max
Kelvin 184 K[19] 287.16 K[20] (years 1961–1990) 330 K[21]
Celsius −89.2 °C 14.0 °C (years 1961–1990) 56.7 °C
Fahrenheit −128.5 °F 57.2 °F (years 1961–1990) 134.0 °F
Atmosphere
Surface pressure
101.325 kPa (at MSL)
Composition by volume
78.08% nitrogen (N
2; dry air)[3]
20.95% oxygen (O
2)
~ 1% water vapor (climate variable)
0.9340% argon
0.0408% carbon dioxide[22]
0.00182% neon[3]
0.00052% helium
0.00017% methane
0.00011% krypton
0.00006% hydrogen
Earth's axis of rotation is tilted with respect to its orbital plane, producing seasons on Earth. The gravitational interaction between Earth and the Moon causes tides, stabilizes Earth's orientation on its axis, and gradually slows its rotation. Earth is the densest planet in the Solar System and the largest and most massive of the four rocky planets.
Earth's outer layer (lithosphere) is divided into several rigid tectonic plates that migrate across the surface over many millions of years. About 29% of Earth's surface is land consisting of continents and islands. The remaining 71% is covered with water, mostly by oceans but also lakes, rivers and other fresh water, which all together constitute the hydrosphere. The majority of Earth's polar regions are covered in ice, including the Antarctic ice sheet and the sea ice of the Arctic ice pack. Earth's interior remains active with a solid iron inner core, a liquid outer core that generates Earth's magnetic field, and a convecting mantle that drives plate tectonics.
Within the first billion years of Earth's history, life appeared in the oceans and began to affect Earth's atmosphere and surface, leading to the proliferation of anaerobic and, later, aerobic organisms. Some geological evidence indicates that life may have arisen as early as 4.1 billion years ago. Since then, the combination of Earth's distance from the Sun, physical properties and geological history have allowed life to evolve and thrive. In the history of life on Earth, biodiversity has gone through long periods of expansion, occasionally punctuated by mass extinctions. Over 99% of all species that ever lived on Earth are extinct. Estimates of the number of species on Earth today vary widely; most species have not been described. Over 7.7 billion humans live on Earth and depend on its biosphere and natural resources for their survival.[23]
Answer:
Earth consists of land, air, water and life. The land contains mountains, valleys and flat areas. The air is made up of different gases, mainly nitrogen and oxygen. The water includes oceans, lakes, rivers, streams, rain, snow and ice.