4th grade-ch. 17 lesson 1 how does earth move
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Ch. 17 Ch. 17 Lesson 1Lesson 1How does How does
Earth move?Earth move?
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clues that Earth clues that Earth is moving:is moving:
1.1. Sun & stars seem to Sun & stars seem to move across skymove across sky
2.2. change of seasonschange of seasons
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Why can’t you feel Why can’t you feel Earth’s movement?Earth’s movement?
Earth moves Earth moves steadily & smoothlysteadily & smoothly
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axisaxisimaginary line that runs imaginary line that runs thru. North Polethru. North Pole Earth’s Earth’s ctr.ctr. South Pole South Pole
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tilt of Earth’s axistilt of Earth’s axis
causes causes seasons seasons to changeto change
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The Earth's Tilt on Its Axis and the Seasons [02:15]
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rotationrotationspinning spinning motion of motion of Earth on Earth on its axisits axis
rotrotaationtionxxiiss
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rotationrotation23 hours & 56 min. 23 hours & 56 min.
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rotationrotationcauses day & nightcauses day & nightEarth rotates from Earth rotates from westwest east east
Earth's rotation animation
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revolutionrevolutionmovement of one movement of one object around anotherobject around another
Rotation-Revolution animation
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The Movement of the Earth [04:18]
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orbitorbitpath Earth takes as it path Earth takes as it revolves around Sunrevolves around Sun
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Force of gravity Force of gravity keeps Earth in its keeps Earth in its orbit.orbit.
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ellipse (elliptical)ellipse (elliptical)Shape of Earth’s orbitShape of Earth’s orbitStretched out circle Stretched out circle (oval)(oval)
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Rotation and Revolution quizRotation and Revolution quiz
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1. What is an axis? 1. What is an axis? 2. The Earth _____around the Sun.2. The Earth _____around the Sun.3. The Earth _____on its axis.3. The Earth _____on its axis.4. Does the Earth rotate and revolve 4. Does the Earth rotate and revolve
at the same time? Explain your at the same time? Explain your answer.answer.