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Answers
Answer:
1.Earth is the only planet in our solar system that has a large amount of liquid water. About 74% of the surface of Earth is covered by liquid or frozen water. Because of this, people sometimes call it the blue planet. Because of its water, Earth is home to millions of species of plants and animals.
2.
Earth's circumference and diameter differ because its shape is classified as an oblate spheroid or ellipsoid, instead of a true sphere. This means that instead of being of equal circumference in all areas, the poles are squished, resulting in a bulge at the equator, and thus a larger circumference and diameter there.
An atmosphere is a layer or a set of layers of gases surrounding a planet or other material body, that is held in place by the gravity of that body.
An atmosphere is more likely to be retained if the gravity it is subject to is high and the temperature of the atmosphere is low.
lithosphere is the rigid, outermost shell of a terrestrial-type planet, or natural satellite, that is defined by its rigid mechanical properties. On Earth, it is composed of the crust and the portion of the upper mantle that behaves elastically on time scales of thousands of years or greater.
Answer:
Earth is called a unique planet because it is the only planet of our solar system which supports life.
2. Earth is not a perfect sphere as it is little flat on poles and buldged on equator. It's circumference is about 40,075km.
3.Atmosphere is the blanket of air which sorrounds the Earth and provide essential gases like oxygen and protect us from UV rays of Sun.
b. Hydrosphere refers to all the water bodies on Earth in all its forms.
c. Lithosphere is the land on which we live.
d. A planet is a heavinly body which follows some acceptions or categories and revolve around its main sequence star.
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