1. The distance of sea level at a certain place is called elevation 2. The concept of orientation is applicable to any place on the earth

1. Altitude: altitude refers to the vertical distance of a certain place on the ground above the sea level. As the name suggests, the so-called altitude is the height above the sea level. However, the sea level has tides, big waves and small waves. It can be said that there is no moment of calm, and there is a significant difference between the sea level of rising tide and falling tide every day every month

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1. Are all the sea levels on earth the same distance from the center of the earth? I was thinking, if it's not the same, what's the altitude
2. What is the distance between the sea level and the earth's center? Is the sea level at the equator the same as that at the North Pole? We are used to saying that there is a unified altitude of 0 in the world. What is the distance between the altitude of 0 and the center of the earth, So can the distance between point a and the geocenter be calculated by X + the distance from 0 to the geocenter? Can the distance between point B and the geocenter be calculated by X + the distance from 0 to the geocenter?
3. 3、 When the height of the terrain is indicated on the map, the sea level should be taken as the datum. Generally, the altitude of the sea level is set at 00, and the elevation of the sea level is set at 0 The number represents the altitude above sea level (1) What is the significance of the altitude of 500 m in Jiadi? (2) What is the significance of the altitude of - 300m in place B? 2. According to the weather forecast one day this year, the lowest temperature in Harbin is - 22 degrees, and the lowest temperature in Haikou is 15 degrees. How much higher is the temperature in Haikou than that in Harbin?
4. The altitude of sea level is not uniform. What is the base of altitude?
5. The highest temperature in Urumqi (about 800 meters above sea level) on a certain day in summer is 35 ℃, and the local highest temperature in Aiding Lake (about - 155 meters above sea level) in Turpan Basin is about?
6. There are qiaogeli peak, the second highest peak in the world with an altitude of 8611m, and Aiding Lake in Turpan with an altitude of - 154m
7. Is the height of Mount Everest 8844.43 meters or 8844.48 meters?
8. Mount Everest is 8844.43 meters high. He started from his base camp at an altitude of 5200 meters The 25-year-old Nepalese broke the world record for the fastest climb to Mount Everest. He set out from his base camp at an altitude of 5200 meters, and it took him about 12 hours to reach the summit. The height of Mount Everest is 8844.43 meters. How many meters does the Nepalese climb per hour?
9. In Xinjiang, China, there are qiaogeli peak, the second highest peak in the world, with an altitude of 8611 meters, and Aiding Lake, Turpan, the second largest pool in the world, with an altitude of - 154 meters
10. The average altitude of the Tibetan Plateau
11. Taking the sea level as the starting point, the vertical distance of a place on the ground above the sea level is called ()
12. How high is Pingxiang from sea level?
13. As shown in the figure, in rectangular paper ABCD, fold it as shown in the figure, and the crease is EF. If the angle EFB = 65 degrees, calculate the degree of angle AED Picture:
14. As shown in the figure, fold one corner of triangle paper ABC, and the crease is EF. If ∠ a = 80 °, B = 68 ° and CFE = 78 °, calculate the degree of ∠ CEF
15. As shown in the figure, after folding one side DC of isosceles trapezoid ABCD along EF, make points D and C fall at d ', C', respectively. If ∠ BFC '= 20, then ∠ EFB has more degrees
16. As shown in the figure, there is rectangular paper ABCD, ab = 6, BC = 8, fold the paper along EF, make point B and point d coincide, and calculate the length of crease EF
17. As shown in the figure, fold the rectangular piece of paper ABCD so that point a coincides with point C, the crease is EF, and ∠ BFC = 65 °, then ∠ bec=
18. How to make a 30 degree angle when the rectangular paper is folded twice
19. Fold a piece of rectangular paper as shown in the figure, where ∠ 1 = 30 ° do you know how many degrees ∠ 2 equals?
20. Help me out three math problems of grade one in junior high school, about folding a corner on a piece of paper and finding the degree of one of the corners, which is similar to this one