Earth is the fifth largest planet in the solar system and the third planet from the sun with about 93 thousand miles away from it. It bulges at the equator and flattens at the poles with its almost round shape and the only planet where life exists.
The three zones of the earth are called the lithosphere, hydrosphere and atmosphere that comprise the land, water and the air. The rocky part down towards the center is called lithosphere while the water and ice portion is called hydrosphere and the air surrounding the earth is called atmosphere. The nine percent of earth is land and about 71 percent is water.
The earth rotates on its axis and this actually causes the day and the night. As a part of the earth faces the sun, it gives us sunlight and calls it daytime. As it faces away completely from the sun, the stars shine and call it the night. For the earth to rotate on its own axis, it will take one whole day or about 23 hours, 56 minutes, and 4.09 seconds. It rotates east to west or counterclockwise . The earth turns 365 ¼ days to complete its rotation in a year.
Now - there are several factors affecting and causing the many seasons on earth. The earth continues to travel around the sun in an orbit thus keeps the earth moving continuously. As the earth orbits the sun - the day changes so thus the temperature. Depending on the place, the heat and the cold vary and because of the inclination of the earth's axis it produces seasons like winter, spring, autumn, and fall. The axis of the earth inclines at 23-26-59 degrees to the plane of its own orbit.
The seasons of the north of the equator are always opposite the seasons of the south thus each pole is turn down the sun for a certain period in a year. When north pole is tilted towards the sun then it would be summer in Northern Hemisphere.
It becomes winter in the Northern Hemisphere when the north pole is tilted away from the sun. The earth leans to one side only when it rotates on its axis and it leans as it goes around the sun and this is how the revolution of the earth produces the four seasons in the Temperature Zone.
The slanting of the sun's rays received by a certain part of the earth brings changes in climate and in seasons. The Torrid Zone which is the middle part of the earth receives the vertical rays of the sun. It is hot in this part of the earth because the rays are direct and straight.
Farther away from the middle part of the earth is the Temperature Zone where it does not receive too much heat from the sun because the rays of the sun that reaches this part of the earth are slanting. It is very cold in the Northern and Southern Hemisphere where it receives the greatest slant of sun rays.
Countries that belong to the Torrid Zone have two seasons: the rainy season and the dry season. There is plenty of rain during the rainy season along with strong winds while it is warm during the dry season. Tropical countries in Asia like the Philippines are one of the countries that enjoy this kind of seasons. It is rainy season from May to October and dry season from November to April. The coolest months are December to February. The nights are longer than the days during December and January while days are longer than nights during March and April.
