ࡱ> dfabca 4bjbj NF\F\n,{ NNvvv:::::%;O77, 8:::::::<?:v893O78989:NN::::89Nv::89:::"T:0e.N9:::0%;:@:4@:@v:(%80U8":w88%8%8%8::L:@%8%8%8%;89898989@%8%8%8%8%8%8%8%8%8 > : Name Date Class  LESSON 1 Earths Motion A. Earth and the Sun 1. The diameter is more than 100 times greater than Earths diameter. a. In the Sun, atoms combine during , producing huge amounts of energy. b. Some of the Suns energy reaches Earth as thermal energy and . 2. is the movement of one object around another object. a. The path a revolving object follows is its . b. It takes approximately one for Earth to make one revolution around the Sun. c. Earth moves around the Sun because of the pull of between Earth and the Sun. 3. The force of gravity between two objects depends on the of the objects and how far apart they are. 4. The of an object is its spinning motion. a. The line around which an object rotates is the . b. Looking at Earth from above the North Pole, Earth rotates in a(n) direction from west to east. c. Earths rotation makes the Sun appear to rise in the . 5. It takes one for Earth to complete one rotation. 6. Earths rotation axis is always in the same direction. B. Temperature and Latitude 1. The Sun shines on the part of Earth that the Sun. 2. When light shines on a tilted surface, the light is more than it would be on a surface that is not tilted. a. Because of the tilt of Earths axis, Earths surface becomes more tilted as you move away from the . b. As a result of this tilt, regions of Earth near the receive less energy than regions near the . 10 The Sun-Earth-Moon System Name Date Class Lesson Outline continued C. Seasons 1. Earths change in a yearly cycle because of the tilt of its rotation axis and Earths around the Sun. 2. The end of Earths that is tilted toward the Sun receives more energy from the Sun. a. The part of Earth tilted toward the Sun experiences seasons of spring and . If the northern end of Earths axis leans toward the Sun, it is spring or summer in the hemisphere. b. The part of Earth tilted away from the Sun experiences seasons of autumn and . If the southern end of Earths axis leans toward the Sun, it is fall or winter in the hemisphere. 3. During a(n) , Earths rotation axis is the most toward or away from the Sun. a. Solstices occur each year. b. The June solstice is the first day of in the northern hemisphere. c. On the December solstice, the end of Earths rotation axis leans the most away from the Sun. 4. During its revolution, Earths axis does not lean toward or away from the Sun during a(n) . a. The September equinox marks the first day of in the southern hemisphere. b. The March equinox marks the first day of in the northern hemisphere. 5. The Suns apparent path through the sky in the northern hemisphere is near the June solstice and near the December solstice. The Sun-Earth-Moon System 11 Name Date Class  LESSON 1 Earths Motion Directions: Complete the chart by writing each statement in the correct space. Earth spins on its rotation axis in a counterclockwise direction. One Earth day equals 24 hours. It takes approximately one year to orbit the Sun. If the gravity between Earth and the Sun somehow stopped, Earth would fly off into space in a straight line. Each day the Sun appears to move from east to west across the sky. Changes in the seasons are caused by changes in the amount of sunlight striking Earth. Summer and winter are opposite seasons in the northern and southern hemispheres. Earth moves around the Sun. Earth moves in a counterclockwise motion. Earths RotationEarths RevolutionTilt of Earth on Its Axis    The Sun-Earth-Moon System 13 Name Date Class   LESSON 1 Earths Motion Key Concept How does Earth move? Directions: On each line, write the term or phrase that correctly completes each sentence. 1. Earth spins on its . 2. It takes about for Earth to rotate one time. 3. A term that is used to describe Earths orbit around the Sun is Earths. . 4. The. of Earths rotation axis stays the same as it orbits the Sun. 5. For one half of the year, the north end of Earths rotation leans toward. . 6. The Sun appears to move from to across the sky. 7. makes the Sun appear to move across the sky. 8. Earth spins in a(n) direction. 9. The Moon and stars seem to move from to across the night sky. 10. As Earth moves around the Sun, the change. 11. The shape of Earths orbit is nearly . 12. Earth moves around the Sun because the Suns pulls on Earth. 13. When it is daytime on the half of Earth facing the Sun, it is on the other half of Earth. 14. Earth would fly off into space in a straight line if the between Earth and the Sun ended. 15. Earths is an imaginary line on which it rotates. 16. Earths rotation axis is . The Sun-Earth-Moon System 17 Name Date Class  LESSON 1 Earths Motion Key Concept Why is Earth warmer at the equator and colder at the poles? Directions: On the line before each effect, write the letter of the cause that correctly completes each sentence. Some causes might be used more than once. Effect 1. The light energy absorbed by a surface depends on 2. A beam of light becomes more spread out as 3. Energy is carried to Earth in 4. Some energy is absorbed by Earths surface when 5. Energy is less concentrated near 6. Less energy reaches the poles because 7. Earth is warmest at the equator because 8. Earth is coldest at the poles because 9. Surface temperature depends on the amount of 10. The surface of Earth 11. Less energy is received in regions where 12. A beam of light 13. Earth is warm at the equator and cold at Cause A. the surface tilts away from it. B. carries energy. C. the beam of light reaches Earth. D. the tilt of the surface. E. the beam of light is spread out more. F. energy is concentrated there. G. Earths poles. H. tilt is the greatest there. I. energy absorbed by the surface. J. a beam of sunlight. K. is curved. 18 The Sun-Earth-Moon System Name Date Class  LESSON 1 Earths Motion Key Concept Why do the seasons change as Earth moves around the Sun? Directions: Answer each question in the space provided. December SolsticeMarch EquinoxJune SolsticeSeptember Equinox1. Where does the north end of Earths axis lean at this time of the year?2. What is true about the number of daylight hours at this time of the year?3. Where does the north end of Earths axis lean at this time of the year?4. What is true about the number of daylight hours at this time of the year?5. Which season does this day mark in the northern hemisphere? In the southern hemisphere?6. Which season does this day mark in the northern hemisphere? In the southern hemisphere?7. Which season does this day mark in the northern hemisphere? In the southern hemisphere?8. Which season does this day mark in the northern hemisphere? In the southern hemisphere?9. Why are temperatures cooler in the northern hemisphere at this time?10. What can be said about the distribution of sunlight at this time?11. Why are temperatures warmer in the northern hemisphere at this time?12. What can be said about the distribution of sunlight at this time? 20 The Sun-Earth-Moon System Name Date Class  LESSON 1 Earths Motion Although you cannot feel it, Earth is moving. It moves around the Sun and its own axis. But for a long time, humans thought Earth was the center of the universe. The Geocentric Model For most of human history, the universe consisted of everything in the sky that could be seen with the unaided eye. The geocentric model of the universe holds that everything in the universethe Sun, Moon, planets, and starsorbits Earth. The geocentric model was the system that Aristotle (384322 B.C.) and Ptolemy (165 ~85 B.C.) taught. Because observations were made by the unaided eye, the scientists of ancient Greece made two assumptions that supported the geocentric model. One assumption was that, because no one felt Earth move, it had to be stationary in space. Otherwise things that were not rooted to Earth, such as animals, would fly away. The second assumption was that other objects in space move around Earth each day. The Sun apparently rises on one side and sets on another side, and star formations apparently move across the sky. The Heliocentric Model The geocentric model was gradually replaced by the heliocentric model of Copernicus, Galileo, and Kepler. Heliocentrism is the theory that the Sun is the center of the solar system, and everything in the solar system revolves around the Sun. A distinction between the solar system and the universe became clear only after the advent of the telescope. In the sixteenth century, the astronomer Nicolaus Copernicus (14731543) designed a mathematical model of a heliocentric system, which was later expanded and defended by Kepler and Galileo. Copernicus concluded that Earth is a planet that revolves around the Sun. To look at the sky, it seems that Earth stays in one place and everything else rises and sets or moves around. But Copernicus observed that, over time, the movements are more complicated. The Sun makes a slower circle over the course of a year, and the planets sometimes reverse direction for a time. Galileo Galilei (15641642) was the first scientist to view the universe through a telescope, which allowed him to make discoveries such as sunspots, topography of the Moon, and some of the moons of Jupiter. He was able to confirm Copernicuss heliocentric model. Applying Critical-Thinking Skills Directions: Respond to each statement. 1. Compare the motions of Earth, the Sun, and the Moon in geocentric and heliocentric models of the universe. 2. Explain the two major motions of Earth in space that can be observed and justified by the geocentric model. 3. Interpret this statement: All fields of science are accumulations of knowledge. Explain how this applies to modern sciences, including the science of astronomy. The Sun-Earth-Moon System 21 Name Date Class   LESSON 1 Earths Motion Seasons and Solstices Earth makes one complete revolution about the Sun each year. Changes in the seasons are caused not by the varying distance between Earth and the Sun but by the tilt of Earth on its axis during that revolution. As Earth orbits the Sun, there are times of the year when the North Pole is alternately tilted toward the Sun or tilted away from the Sun. At other times the axis is generally parallel to the incoming Suns rays. Draw a Diagram On a separate sheet of paper, draw Earth in four positionsat the March and September equinoxes and the June and December solstices. Clearly indicate the tilt of Earths axis. Include the Sun and the direction of Earths revolution around the Sun. Indicate the angle of the Suns rays at each position. Directions: Respond to each statement on the lines provided. 1. Determine Earths season in each hemisphere at each solstice. Include relative daytime length. 2. Explain why all locations on Earth have equal hours of day and night on about March 21 and September 23. 3. Decide which position on Earth (equator or pole) receives the greatest intensity of sunlight on June 21. 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