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课件网) 2025年完胜高考语法填空 (2篇) Earth and the Sun How Do We Know Earth Is Rotating We talk about the sun rising in the morning and setting at dusk, but in reality the sun isn’t moving—we are! Earth rotates, or spins on its axis, just like a spinning top. The axis is an imaginary line through Earth from the North Pole 1._____ the South Pole. Earth and the Sun to 一 It takes about 24 hours for Earth to make one rotation, or complete spin, on the axis. As each part of Earth rotates toward and away from the sun, we experience periods of daylight and darkness. As the day begins, the sun appears to “rise” in the east. By midday, the sun reaches its 2._____(high) point in the sky. In the afternoon, as Earth keeps 3._____(rotate) , the sun appears to get lower in the sky, until it “sets” in the west. Earth makes this rotation about 365 times each year. highest rotating How do we know that Earth is spinning One way is data from satellites. Satellites can observe the rotation of Earth from space. An early piece of evidence was discovered by a French scientist named Jean Foucault (foo-KOH). A pendulum, or suspended weight, was hung by a long string. It was made to swing back 4.____ forth, north to south. As hours passed, the direction the pendulum was swinging moved around in a clockwise direction. After a while, it was swinging northeast-southwest; after a bit, it was swinging east-west, then southeast-northwest, then finally north-south again. What caused this change in the pendulum’s direction of swing was that Earth was rotating under it. and The shape of Earth is also a clue that it is rotating. Earth is not a perfect sphere. It is 5._____(slight) flattened at the North and South Poles and bulges slightly at the equator. It is similar to 6._____ happens in a washing machine. As the clothes spin around, they get 7._____(throw) to the edge. As Earth spins, its matter also gets shifted to the “edge,” creating a slightly bulging equator. slightly what thrown The Reason for Seasons In many parts of the United States, as you switch from a bathing suit to 8._____ sweater to a winter coat to a T-shirt, you have certainly noticed that seasons change every year. The two biggest 9._____(sign) of change are temperature and length of day. Do you know what 10._____(cause) these changes signs a causes Earth takes 365 1/4 days to revolve, or travel in its orbit, once around the sun. One complete trip around the sun is called a revolution. Remember that 1._____ Earth is revolving, it is also rotating on its axis. However, the axis is not vertical. It is tilted 2._____ an angle of 23 1/2° and always points in the same general direction. This means that as Earth goes around its orbit, the Northern Hemisphere (places north of the equator such as the United States, while 二 at Europe, and China) is at times leaning more toward or more away from the sun. When it is summer in the United States, the North ... ...
