Writing
Write a short composition on the planet earth with the given hints. 5 Marks
Hints - (our earth ..... only planet Life ........70% of the earth..... water
ball
moves round the sun.)
blue planet.........looks like a round
Answers
Answer:
(short for “solar day”). Mars’s axis of rotation is tilted 25.2 degrees relative to the plane of the planet’s orbit around the sun, which helps give Mars seasons similar to those on Earth. Whichever hemisphere is tilted closer to the sun experiences spring and summer, while the hemisphere tilted away gets fall and winter. At two specific moments each year—called the equinoxes—both hemispheres receive equal illumination.
But for several reasons, seasons on Mars are different from those on Earth. For one, Mars is on average about 50 percent farther from the sun than Earth is, with an average orbital distance of 142 million miles. This means that it takes Mars longer to complete a single orbit, stretching out its year and the lengths of its seasons. On Mars, a year lasts 669.6 sols, or 687 Earth days, and an individual season can last up to 194 sols, or just over 199 Earth days.
The angle of Mars’s axis of rotation also changes much more often than Earth's, which has led to swings in the Martian climate on timescales of thousands to millions of years. In addition, Mars’s orbit is less circular than Earth’s, which means that its orbital velocity varies more over the course of a Martian year. This annual variation affects the timing of the red planet’s solstices and equinoxes. On Mars, the northern hemisphere’s spring and summer are longer than the fall and winter.
There’s another complicating factor: Mars has a far thinner atmosphere than Earth, which dramatically lessens how much heat the planet can trap near its surface. Surface temperatures on Mars can reach as high as 70 degrees Fahrenheit and as low as -225 degrees Fahrenheit, but on average, its surface is -81 degrees Fahrenheit, a full 138 degrees colder than Earth’s average temperature.
Answer:
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Components of water
Water is present in all its three forms-solid(ice), liquid(water) and gaseous(water
vapour) on the earth. Water, in its liquid form, is available in oceans, seas, rivers, lakes and ponds on the surface of the earth. It occurs in its frozen(solid) form on polar ice
caps and glaciers. Its gaseous, or vapour, form is present in air that surround us.Water is present in abundance but is still scarce.About 97 per cent of all the water on earth is present in oceans and seas. This water is very salty and cannot be used for our daily needs. Only 3 per cent of water, on the earth, is fresh water which is good for human use. Most of this fresh water, however OCCurs as snow, in the form of glaciers and ice caps, or as water vapour in air. Somne amount of fresh water is present as ground water. This may be used for some purposes but it is often not readily available. It is only 0.3 per cent of fresh water, present in rivers, lakes and streams, that is readily available for use. The following diagramillustrates this.
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