What are the physical or orbital characteristics of planet earth?

Question

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Answer 1

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Answer 2

these are the Physical characteristics of Earth .

Physical characteristics include shape, size and composition.

Spherical in shape

Just as the Sun and Moon appear as spheres, so too is the Earth spherical in shape. To people on Earth, the planet appears to be generally flat (not counting for hills and valleys), but in reality the surface of the Earth has a slight curve. This can be noticed when looking out on a large lake or the ocean and seeing a ship come up along the horizon.

Ship coming up over the horizon

The shape of the Earth has been proven by ships circling the Earth, as well as from pictures of the Earth taken from the space vehicles.

View of Earth from space

Its shape is actually slightly flattened at the poles.

Size

The diameter of the Earth at the equator is 12,756 km (7,926 miles), and its circumference or distance around the Earth at the equator is 40,075 km (24,901 miles).

Composition

The composition of the Earth consists of the solid and liquid portion and the atmosphere or gaseous portion.

Solid and liquid

The percentage composition of the Earth's solid and liquid materials (by mass) is:

Element Percentage

Iron 34.6%

Oxygen 29.5%

Silicon 15.2%

Magnesium 12.7%

Nickel 2.4%

Sulfur 1.9%

Titanium 0.05%

Oxygen is chemically combined with many substances to produce liquid and solid compounds. Although water (H2O) is a dominant compound on Earth, Hydrogen is not listed above because of its small mass.

Silicon Dioxide (SiO2) is sand, and that compound makes up a large portion of the Earth's mass. Much of the Iron is in the Earth's core and is responsible for the Earth's magnetic field.

Atmosphere

Although most people think air is mainly Oxygen, the atmosphere of the Earth actually consists of 79% Nitrogen (N2), 20% Oxygen (O2) and 1% of other gases such as Carbon Dioxide (CO2).

these are the Orbital characteristics  

Mean radius                         149,597,870 km  

Perihelion                               0.983 AU  

Aphelion                                  1.017 AU  

Eccentricity                              0.01671022  

Orbital period                         365.25636 days  

Avg. Orbital Speed                 29.7859 km/s  

Inclination                                 0.00005°  

Satellitess                              1 (the Moon)  

Satellite of                                  Sun

Answer 3

Circular.

Answer 4

The earth is revolving the sun in an elliptical path. The area covered at any particular time between sun and earth is always equal. Therefore the rate of moving will be slow when the earth is far away from sun.