Our Earth’s circumference at the equator is approximately 40 076.592 km. Almost 40 009 km if we measure the circumference of the pole to pole. The Earth is OBLATE due to centrifugal force, the water cycle, erosion of various kinds, etc.
Exercise: If you take a rope and measure half the earth diameter using 1 cm for each 10 km, Ie 12 756 km divided by 2 and allows 10 km equal to 1 cm on the rope, you get a rope that is 37.8 cm long (approximately 6 feet). Take this rope with you to the schoolyard, a parking place, a lawn, etc, and ask a student to keep one of the ends at a centre point, while you turn a circle using the rope to help you. The circle will thus represent the earth.
To understand the relationships between the earth’s size and our highest mountains and deepest ocean sinks, please check in Geography mapbook, for the hights of Mount Everest. 8848 m. Ie.
On your cirkel a small drawn mark less than 1 cm will correspond to Mount Everest. Make that mark. Turn up the Marianergrave on the map. The Marinergrave is the world’s deepest point in Earth’s crust. 10911 meters. In other words, no more than a 1 cm INWARD BEND from your circle. There You then see is the small part of the earth as we humans in general have been on or below in order to SNIFF of knowledge of.
arth’s tilt, rotation, etc.: Earth angle’s gradient, oblikvitety, varies relative to the Earth’s direction of rotation between 22.1 and 24.5 degrees (do not forget that a circle has 360 degrees) This variation is relatively regular and recurring per every 41 000 year. We have currently a decreasing angle.
arth wobbles, ie in addition to the Earth angle’s inclination that varies with time, cycle of 41,000 years, the axis vary relative to the sun and the second due to the earth just like a gyrosnurras peak ‘shake’ when the pace slows down or increases. This wobbling is part of the earth cycle for 26 000 years.
angea: Once long ago all continents coherent with each other. This one continent was called Pangea. When it broke up it broke into tectonic plates that moved out of each other while they ‘floated’ in the ultimate surface of the Earth mantle. Thus they sometimes glided over / under one another. Sometimes the tectonic plates collided or retard from each other. That was how our mountain ranges were formed when volcanoes, earthquakes, landslides, etc. changed the outher parts of our world. This currently occurs. In the case of landslides, there are several other conditions that affect more than the tectonic plate movements and hollows. However, these must also be included in all calculations.
Exercise: If you take a book and your friend takes another and you put your opposite one another and keep the books about as high, so happens one of the following phenomenon when you order them against each other:
* They collide and fold
* The collisions and the pressure make the retard away or one goes down back to the Mantle’s 1500 degrees C heat and become a floating mix of chemical substances.
* They collide and slide above and below each other.
ote that the ‘effects’ that we humans perceive them to the tectonic plates float around and gnaw on or collide with each other. We have Earthquakes; volcanic eruptions; etc.
or a long period of time, several million years this changing made our mountains to what they are. All these facts must be taken into account when calculating the earth’s climate.