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Unit 4 Lesson 1 Part II Earth’s Days, Years, and Seasons

Unit 4 Lesson 1 Part II. Earth's Days, Years, and Seasons Copyright Houghton Mifflin Harcourt Publishing Company Unit 4 Lesson 1 Earth's Days, Years, and Seasons Seasons change . What causes Seasons ? Most locations on Earth experience Seasons . Each season is characterized by a pattern of temperature and other weather trends. We experience Seasons due to changes in the intensity of sunlight and the number of daylight hours as Earth revolves around the sun. Copyright Houghton Mifflin Harcourt Publishing Company Unit 4 Lesson 1 Earth's Days, Years, and Seasons What causes Seasons ? At an equinox, sunlight shines equally on the Northern and Southern hemispheres. Half of each hemisphere is lit, and half is in darkness. As Earth moves along its orbit, the sunlight reaches more of one hemisphere than the other. At a solstice, the area of sunlight is at a maximum in one hemisphere and at a minimum in the other hemisphere.

Title: 4.1 - 2 Earth's Days, Years & Seasons.ppt Author: P00024561 Created Date: 9/27/2012 4:54:30 AM

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Transcription of Unit 4 Lesson 1 Part II Earth’s Days, Years, and Seasons

1 Unit 4 Lesson 1 Part II. Earth's Days, Years, and Seasons Copyright Houghton Mifflin Harcourt Publishing Company Unit 4 Lesson 1 Earth's Days, Years, and Seasons Seasons change . What causes Seasons ? Most locations on Earth experience Seasons . Each season is characterized by a pattern of temperature and other weather trends. We experience Seasons due to changes in the intensity of sunlight and the number of daylight hours as Earth revolves around the sun. Copyright Houghton Mifflin Harcourt Publishing Company Unit 4 Lesson 1 Earth's Days, Years, and Seasons What causes Seasons ? At an equinox, sunlight shines equally on the Northern and Southern hemispheres. Half of each hemisphere is lit, and half is in darkness. As Earth moves along its orbit, the sunlight reaches more of one hemisphere than the other. At a solstice, the area of sunlight is at a maximum in one hemisphere and at a minimum in the other hemisphere.

2 Copyright Houghton Mifflin Harcourt Publishing Company Unit 4 Lesson 1 Earth's Days, Years, and Seasons What causes Seasons ? During the September equinox, sunlight shines equally on both poles. During the March equinox, half of each hemisphere is lit, and the sunlight is centered on the equator. Copyright Houghton Mifflin Harcourt Publishing Company Unit 4 Lesson 1 Earth's Days, Years, and Seasons What causes Seasons ? At the December solstice, the North Pole leans away from the sun and is in complete darkness, and the South Pole is in complete sunlight. At the June solstice, the North Pole leans toward the sun and is in complete sunlight, and the South Pole is in complete darkness. Copyright Houghton Mifflin Harcourt Publishing Company Unit 4 Lesson 1 Earth's Days, Years, and Seasons What causes Seasons ? Copyright Houghton Mifflin Harcourt Publishing Company


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