Tuesday, March 20, 2012 Competency 4e – DOK 2 8th Grade – Lesson 8.2 Name: ____________________________________ Period: ____ Explain how the tilt of Earth’s axis and the position of the Earth in relation to the sun determine climatic zones, seasons, and length of the days. I can explain that the tilt of the Earth’s axis causes seasons. I can determine the season in a hemisphere based on how sunlight hits it. Page 2 Unit 8 – Weather: Earth’s Seasons Quick Review: 1. The molecule that is found inside of all cells that contains the instructions for how the cell functions = DNA 2. A section of DNA that determines a specific trait = gene 3. The four nucleotides that make up DNA are adenine, thymine, guanine, and cytosine 4. For the instructions in DNA to be turned into action by the cell, the DNA is used to make RNA by transcription, and RNA is used to make protein by translation. 5. A scientist has one strand of DNA below. What is the complementary strand? A–T–C–C–G–A–T–T–A–G Key Points on Earth’s Seasons: 1. The Earth rotates around its axis which is titled at an angle of 23.5°. The tilt of the Earth’s axis is what gives us seasons. 2. The tilt of the Earth’s axis does NOT change. As the Earth revolves (orbits) around the Sun, parts of the Earth are pointed toward the Sun and parts are pointed away from the Sun. a. The hemisphere that is pointed toward the Sun has summer. b. The hemisphere that is pointed away the Sun has winter. 3. When a hemisphere is not pointed toward or away from the Sun, it is either spring or fall. 4. The Northern Hemisphere and the Southern Hemisphere have opposite seasons. When it is summer in the Southern Hemisphere, it is winter in the Northern Hemisphere. a. The Northern Hemisphere is above the equator and the Southern Hemisphere is below the equator. b. The United States is located in the Northern Hemisphere. Earth’s Seasons: Guided Practice Use the picture at the right to answer questions 1 through 4. 1. Which hemisphere is experiencing summer? 2. Which hemisphere is experiencing winter? 3. Put an X on the picture to show where the Northern Hemisphere would be located when it is summer there. 4. Put a star on the picture to show where the Northern Hemisphere would be located when it is fall there. 5. A climatologist states that regions near the equator have very little change in temperature throughout the year. Using you knowledge of why seasons exist, explain this phenomenon. Tuesday, March 20, 2012 Competency 4e – DOK 2 8th Grade – Lesson 8.2 Name: ____________________________________ Period: ____ Explain how the tilt of Earth’s axis and the position of the Earth in relation to the sun determine climatic zones, seasons, and length of the days. I can explain that the tilt of the Earth’s axis causes seasons. I can determine the season in a hemisphere based on how sunlight hits it. Page 2 Unit 8 – Weather: Earth’s Seasons Quick Review: 1. The molecule that is found inside of all cells that contains the instructions for how the cell functions = 2. A section of DNA that determines a specific trait = 3. The four nucleotides that make up DNA are , , , and 4. For the instructions in DNA to be turned into action by the cell, the DNA is used to make by transcription, and is used to make protein by . 5. A scientist has one strand of DNA below. What is the complementary strand? A–T–C–C–G–A–T–T–A–G Key Points on Earth’s Seasons: 1. The Earth rotates around its which is titled at an angle of . The tilt of the Earth’s axis is what gives us . 2. The tilt of the Earth’s axis does change. As the Earth (orbits) around the Sun, parts of the Earth are the Sun and parts are from the Sun. a. The hemisphere that is pointed the Sun has . b. The hemisphere that is pointed the Sun has . 3. When a hemisphere is pointed or from the Sun, it is either or . 4. The Northern Hemisphere and the Southern Hemisphere have . When it is summer in the Southern Hemisphere, it is in the Northern Hemisphere. a. The Hemisphere is the and the Hemisphere is the . b. The United States is located in the Hemisphere. Earth’s Seasons: Guided Practice Use the picture at the right to answer questions 1 through 4. 1. Which hemisphere is experiencing summer? 2. Which hemisphere is experiencing winter? 3. Put an X on the picture to show where the Northern Hemisphere would be located when it is summer there. 4. Put a star on the picture to show where the Northern Hemisphere would be located when it is fall there. 5. A climatologist states that regions near the equator have very little change in temperature throughout the year. Using you knowledge of why seasons exist, explain this phenomenon. Tuesday, March 20, 2012 Name: ____________________________________ Period: ____ Earth’s Seasons: Independent Practice Answer the following questions as a scientist would. Explain WHY using COMPLETE sentences! 1. If a hemisphere is pointed away from the sun, which season will it experience? 2. If a hemisphere is pointed neither toward nor away from the sun, which two seasons could it be experiencing? 3. If a hemisphere is pointed toward the sun, which season will it experience? Use the image at the right to answer questions 4 and 5. 4. Which season is the Southern Hemisphere experiencing? 5. Which season is the Northern Hemisphere experiencing? Challenge Questions: 6. If the Earth’s axis was not tilted 23.5° but was vertical instead, what impact would this have? Follow the instructions below to add the following objects to the diagram. 7. Draw the location of the Earth when the Northern Hemisphere is experiencing summer. Label this A. 8. Draw the location of the Earth when the Southern Hemisphere is experiencing summer. Label this B. 9. Draw the location of the Earth when the Southern Hemisphere is experiencing fall and the Northern Hemisphere is experiencing spring. Label this C. 10. Draw the location of the Earth when the Southern Hemisphere is experiencing spring and the Northern Hemisphere is experiencing fall. Label this D.