Survey
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* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Objective – Students will understand how Earth’s tilt on its axis changes the length of daylight and creates the seasons. Seasons Review Guide Seasons Vocabulary You Should Know and Use Axis – An imaginary line going from the North Pole to the South Pole. The Earth spins on this line. Direct Sunlight – Covers a small surface area; heat is concentrated and warmer; Sun is high in the sky; summer heat energy is direct. Indirect Sunlight – Covers a large surface area; heat is spread out and colder; Sun is low in the sky; winter heat energy is indirect. Orbit – The path that a planet travels as it goes around the Sun or a moon takes as it goes around a planet. Revolution – The circling of the Earth around the Sun. (The Moon also revolves around the Earth.) It takes 365 days (one year) for the Earth to revolve once around the Sun. Rotation – The Earth spinning on its axis. It takes the Earth 24 hours (one day) to revolve one time around its axis. Seasons – Due to the tilt of Earth as it travels around the Sun, we have spring, summer, fall, and winter. Tilt – The Earth’s axis is not straight up and down, instead it leans at a 23.5-degree angle. I. Earth’s Tilt a. Earth is tilted 23.5o. The Earth’s axis always points towards the North Star (Polaris). North Pole South Pole II. Earth’s Revolution a. Earth moves (revolves) around the Sun. b. Earth’s orbit is almost a perfect circle as it revolves around the Sun. ~1~ Objective – Students will understand how Earth’s tilt on its axis changes the length of daylight and creates the seasons. III. Identify the position of the Earth and Sun at the beginning of each season. Spring Summer Winter Autumn IV. Identify the dates of the equinoxes and solstices in both hemisphere. a. Equinox – “Equal Nights.” Daylight and nighttime hours are both 12 hours long. b. Solstice – The dates when the Sun appears at its highest in the sky and lowest in the sky. Date Event Northern Event Southern Hemisphere Hemisphere March 21st Vernal Equinox Autumnal Equinox June 21st Summer Solstice Winter Solstice September 21st Autumnal Equinox Vernal Equinox December 21st Winter Solstice Summer Solstice ~2~ Objective – Students will understand how Earth’s tilt on its axis changes the length of daylight and creates the seasons. V. Identify the position of the Sun in the sky during each seasons. Sun highest in the Summer Sun in between in Autumn and Spring Sun lowest in the Winter VI. Identify the correct appearance of the Earth in a diagram at each season (with Earth & Sun). Earth – Northern Hemisphere Summer (Summer Solstice) Earth – Northern Hemisphere Winter (Winter Solstice) ~3~ Objective – Students will understand how Earth’s tilt on its axis changes the length of daylight and creates the seasons. Northern Hemisphere Autumn (Autumnal Equinox) & Spring (Vernal Equinox) VII. Define the difference between direct and indirect heat energy from the Sun. a. In the winter, light comes in at a lower angle. The same amount of heat energy/Sunlight covers a large area. b. In the summer, light comes in at a high angle. The same amount of heat energy/Sunlight covers a small area. ~4~ Objective – Students will understand how Earth’s tilt on its axis changes the length of daylight and creates the seasons. VIII. Compare and contrast revolution and rotation. a – Rotation b - Revolution a. Rotation – Earth turns around its axis; rotates once every 24 hours (day). b. Revolution – Earth revolves around the Sun; revolves once every 365 days (one year). IX. Describe what causes day and night. a. Day and night is caused by the rotation of the Earth. b. When where you are is pointed toward the Sun, it is day. Then the Earth rotates you away from the Sun, and it is night. ~5~ Objective – Students will understand how Earth’s tilt on its axis changes the length of daylight and creates the seasons. X. Compare hours of daylight during each season. December Winter – Northern Hemisphere spends more time in darkness. Daylight hours are shorter during the winter; nighttime hours are longer. Summer – Southern Hemisphere spends more time in daylight. Daylight hours are longer during the summer; nighttime hours are shorter. City City 6 Months Later June Summer – Northern Hemisphere spends more time in daylight. Daylight hours are longer during the summer; nighttime hours are shorter. Winter – Southern Hemisphere spends more time in darkness. Daylight hours are shorter during the winter; nighttime hours are longer. XI. Seasons are reversed in the Northern and Southern Hemisphere. Season Northern Hemisphere Season Southern Hemisphere Summer Autumn/Fall Winter Spring Winter Spring Summer Autumn/Fall ~6~