Earth knowledge (earth knowledge, how it works)
From the sky, the earth is a beautiful blue sphere. In fact, Earth takes on a slightly flattened shape at the poles. Clouds hovered over the Earth’s surface, covering a large swath of black land. Now let’s take a look at our Earth – a planet that has been studied for thousands of years and remains a mystery.
How does the earth work?
1 The Earth orbits an imaginary axis for nearly 24 hours—that is, a day. There is an inclination of 2327° between the earth’s axis and the revolution plane. So the length of each day and night is not exactly the same.
Our planet revolves around the sun in an elliptical orbit. It takes one year (about 365 days) to go around the sun. Because the Earth’s axis is tilted, the sun’s rays hit the Earth’s surface at an angle, which causes the seasons to change. In the equatorial region, the temperature is high all year round, and the sun is directly or near direct all the year round, and the boundaries of the four seasons are not obvious.
There is at least one day in the Arctic and Antarctic where the sun never rises, and at least one day when the sun never sets. It is a place of extreme day and night for a month.
Under the gravitational force of the sun’s center of gravity, the earth rotates in the same orbit. And the gravity of the sun’s center of gravity will also attract water or other substances on the earth’s surface. Tides are the periodic fluctuations of the ocean’s surface under the gravitational pull of the sun and moon.
When the sun and the moon are at right angles, the tide height is lower, which is called “neap tide”.
When the sun and moon are on the same line of the friendship resource, the height of the tide is higher (new moon and full moon).
When the sun and moon are in line, the height of the tides is higher (new moon and full moon).
The internal structure of the earth is divided into three parts: the outer thin crust, the middle mantle and the core. Together the crust and the harder top of the upper mantle are called the lithosphere. 660-2890 kilometers underground, the lower mantle is malleable. Here, despite extremely high temperatures, the lower mantle remains strong under enormous pressure. The inner core can also be divided into two parts, the inner core is hard and the outer core is molten iron or molten nickel.
Basic theory of plate tectonics
The crust is not a whole piece, but consists of many plates floating in the asthenosphere . These plates move 1-2 cm per year, getting closer or further apart from each other. Regardless of whether it is close to the resource network or far away, magma will flow to the surface along the fault line. If there are no new layers of lava on the surface, the thickness of the plate will increase. When the Earth was formed, volcanic eruptions became more intense and frequent.
continuously moving continent
The continents carried by the plate are constantly moving away from each other, but they were all a superpart of the continent. You can simply rebuild it. Imagine putting all the continents together like a puzzle.