LEQ: What causes the cycle of seasons on Earth?

1
LEQ What causes the cycle of seasons on Earth?

• Key Terms Revolution, axis, solstice, equinox,
  vernal equinox, autumnal equinox.

2
Pre Quiz

• Before continuing the slide show please link to
  and take the Seasons on line pre quiz
• Seasons Pre Quiz
• Record your score on your notes sheet.

3
Earths Motions

• The Earth experiences two major motions as it
  travels through space
• Rotation
• Revolution

4
How Sunlight Hits Earth

• The more direct the suns rays strike the Earth,
  the warmer the temperature.

5
Earths Tilted Axis

• Because the Earth is tilted on its axis 23.5
  degrees, we experience changes in
• The amount of daylight during the year.
• The angle at which the suns rays strike
  different parts of the Earth.
• Lets view the video clip about Earths tilt.

6
Exploring the Seasons

• Lets view the video clip about the seasonal
  changes by latitude.
• Important terms
• Equinox 2 days of the year when we have equal
  day, equal night.
• Solstice 2 days of the year when the sun is
  directly overhead at 23.5 degrees north of the
  equator, or 23.5 degrees south of the equator.

7
The Earth in June

• Northern hemisphere is pointed toward the sun,
  the southern hemisphere is pointed away from the
  sun.
• The suns rays are more direct in the Northern
  Hemisphere, and less direct in the southern
  hemisphere.
• The northern hemisphere experiences summer, the
  southern hemisphere experiences winter.
• The June (summer) solstice is on June 21.

8
The Earth in September

• Neither hemisphere is pointed toward the sun.
• The suns rays are direct over the equator.
• The southern hemisphere experiences spring, the
  northern hemisphere experiences fall.
• The September (autumnal) equinox is on September
  21.

9
The Earth in December

• Southern hemisphere is pointed toward the sun,
  the northern hemisphere is pointed away from the
  sun.
• The suns rays are more direct in the southern
  Hemisphere, and less direct in the northern
  hemisphere.
• The southern hemisphere experiences summer, the
  northern hemisphere experiences winter.
• The December (winter) solstice is on December 21.

10
The Earth in March

• Neither hemisphere is pointed toward the sun.
• The suns rays are direct over the equator.
• The southern hemisphere experiences fall, the
  northern hemisphere experiences spring.
• The March (vernal) equinox is on March 21.

11
Seasons in the northern and southern hemispheres.

• Lets view the Video clip to learn more about the
  seasons in the northern and southern hemispheres.

12
Review

• This activity will help you review our LEQ.
  Please try it.
• Seasons Animation

13
Pearson Successnet

• Navigate to your Pearson Successnet to do list,
  and do the following activities
• A. 1.2 What Causes Seasons summary activity.
• B. 1.2 Seasons and Earths Revolution
  interactive art activity.
• This activity will be graded.

14
Last Step

• Pick up a copy of the Seasons Activity Sheet.
• On part 1, use the word bank, and label the
  diagram.
• On part 2, do the seasons game.
• Turn in your Power Point Notes and your Activity
  sheet when complete.