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Ch 23 Section I The Earth
 
Earth is now known to be a round 3-dimensional sphere
Axis – imaginary vertical line around which earth spins
Rotation – the spinning of Earth around its axis that causes day and night
Earth has a magnetic field with north and south poles
Cause of seasons <ul><li>Revolution – Earth’s yearly orbit around the sun </li></ul>
Earth’s orbit is an ellipse. or elongated, closed curve
<ul><li>Because the Sun is not centered in the ellipse, the distance between Earth and the Sun changes during the year </l...
Earth’s tilt causes the seasons
The hemisphere tilted toward the Sun receives more daylight
The longer period of sunlight is one reason summer is warmer than winter.
Earth’s tilt causes the Sun’s radiation to strike the hemisphere at different angles
<ul><li>The hemisphere tilted toward the Sun receives more total solar radiation than the hemisphere tilted away from the ...
Solstice <ul><li>the day when the sun reaches its greatest distance north or south of the equator </li></ul><ul><li>Summer...
Equinox <ul><li>the day when the sun is directly over Earth’s equator </li></ul><ul><li>Daytime and nighttime hours are eq...
<ul><li>Spring equinox occurs on March 20 or 21 in the northern hemisphere </li></ul><ul><li>Fall / Autumnal equinox occur...
Motions of the moon <ul><li>The moon rotates on its axis </li></ul><ul><li>The moon’s rotation takes 27.3 days with the sa...
Moon Phases – the different forms the Moon takes in its appearance from Earth
New Moon – when the moon is between earth and the sun and cannot be seen
Waxing phases <ul><li>more of the illuminated half of the moon that can be seen each night after the new moon </li></ul>
First visible thin slice of the moon is a waxing crescent
<ul><li>First quarter phase – half the lighted side of the moon is visible </li></ul><ul><li>Waxing gibbous – more than on...
All of the Moon’s lighter side is visible during a full moon
Waning phases – less of the illuminated half of the Moon is visible after the full moon.
<ul><li>Waning gibbous – starts after a full moon where more than half of the lighted side is still visible. </li></ul><ul...
The last visible slice before a new moon is called the waning crescent
Eclipses – when the Earth or the moon casts a shadow on the other
Solar Eclipse <ul><li>the moon moves directly between the Earth and the Sun, shadowing part of the Earth </li></ul>
A total solar eclipse is visible only on a small area of Earth
 
Lunar Eclipse – when Earth’s shadow falls on the moon
 
The Moon’s surface has many depressions, or craters. formed from meteorites, asteroids, and comets
 
Cracks in the Moon’s crust caused lava to fill large craters, forming maria, or dark, flat areas
Data from moonquakes suggest that under the Moon’s crust might lie a solid mantle, then a partly molten mantle and a solid...
Impact Theory of Moon Origin <ul><li>the Moon formed4.6 billion years ago from Earth material thrown off when a large obje...
Impact Basins <ul><li>or craters, are depressions left by objects striking the Moon (or anything else!!!!!) </li></ul>
Quiz concepts <ul><li>AXIS  ROTATION </li></ul><ul><li>REVOLUTION  ELLIPSE </li></ul><ul><li>MAGNETIC FIELD </li></ul><ul>...
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Ch 23

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Ch 23

  1. 1. Ch 23 Section I The Earth
  2. 3. Earth is now known to be a round 3-dimensional sphere
  3. 4. Axis – imaginary vertical line around which earth spins
  4. 5. Rotation – the spinning of Earth around its axis that causes day and night
  5. 6. Earth has a magnetic field with north and south poles
  6. 7. Cause of seasons <ul><li>Revolution – Earth’s yearly orbit around the sun </li></ul>
  7. 8. Earth’s orbit is an ellipse. or elongated, closed curve
  8. 9. <ul><li>Because the Sun is not centered in the ellipse, the distance between Earth and the Sun changes during the year </li></ul>
  9. 10. Earth’s tilt causes the seasons
  10. 11. The hemisphere tilted toward the Sun receives more daylight
  11. 12. The longer period of sunlight is one reason summer is warmer than winter.
  12. 13. Earth’s tilt causes the Sun’s radiation to strike the hemisphere at different angles
  13. 14. <ul><li>The hemisphere tilted toward the Sun receives more total solar radiation than the hemisphere tilted away from the sun </li></ul>
  14. 15. Solstice <ul><li>the day when the sun reaches its greatest distance north or south of the equator </li></ul><ul><li>Summer solstice occurs June 21 or 22 in the northern hemisphere </li></ul><ul><li>Winter solstice occurs December 21 or 22 in the northern hemisphere </li></ul>
  15. 16. Equinox <ul><li>the day when the sun is directly over Earth’s equator </li></ul><ul><li>Daytime and nighttime hours are equal all over the world </li></ul>
  16. 17. <ul><li>Spring equinox occurs on March 20 or 21 in the northern hemisphere </li></ul><ul><li>Fall / Autumnal equinox occurs on September 22 or 23 in the northern hemisphere </li></ul>
  17. 18. Motions of the moon <ul><li>The moon rotates on its axis </li></ul><ul><li>The moon’s rotation takes 27.3 days with the same side always facing the Earth </li></ul><ul><li>The moon seems to shine because it reflects sunlight </li></ul>
  18. 19. Moon Phases – the different forms the Moon takes in its appearance from Earth
  19. 20. New Moon – when the moon is between earth and the sun and cannot be seen
  20. 21. Waxing phases <ul><li>more of the illuminated half of the moon that can be seen each night after the new moon </li></ul>
  21. 22. First visible thin slice of the moon is a waxing crescent
  22. 23. <ul><li>First quarter phase – half the lighted side of the moon is visible </li></ul><ul><li>Waxing gibbous – more than one quarter is visible </li></ul>
  23. 24. All of the Moon’s lighter side is visible during a full moon
  24. 25. Waning phases – less of the illuminated half of the Moon is visible after the full moon.
  25. 26. <ul><li>Waning gibbous – starts after a full moon where more than half of the lighted side is still visible. </li></ul><ul><li>Only half the Moon’s lighted side is visible during the third quarter phase </li></ul>
  26. 27. The last visible slice before a new moon is called the waning crescent
  27. 28. Eclipses – when the Earth or the moon casts a shadow on the other
  28. 29. Solar Eclipse <ul><li>the moon moves directly between the Earth and the Sun, shadowing part of the Earth </li></ul>
  29. 30. A total solar eclipse is visible only on a small area of Earth
  30. 32. Lunar Eclipse – when Earth’s shadow falls on the moon
  31. 34. The Moon’s surface has many depressions, or craters. formed from meteorites, asteroids, and comets
  32. 36. Cracks in the Moon’s crust caused lava to fill large craters, forming maria, or dark, flat areas
  33. 37. Data from moonquakes suggest that under the Moon’s crust might lie a solid mantle, then a partly molten mantle and a solid, iron rich, core.
  34. 38. Impact Theory of Moon Origin <ul><li>the Moon formed4.6 billion years ago from Earth material thrown off when a large object collided with Earth </li></ul>
  35. 39. Impact Basins <ul><li>or craters, are depressions left by objects striking the Moon (or anything else!!!!!) </li></ul>
  36. 40. Quiz concepts <ul><li>AXIS ROTATION </li></ul><ul><li>REVOLUTION ELLIPSE </li></ul><ul><li>MAGNETIC FIELD </li></ul><ul><li>EARTH TILT SEASONS </li></ul><ul><li>ANGLE OF SUNLIGHT </li></ul><ul><li>SOLSTICE EQUINOX </li></ul><ul><li>WAXING PHASES </li></ul><ul><li>WANING PHASES MOON PHASES </li></ul>

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