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51. Why does our calendar usually include a leap year every four years? (A) The Moon's orbit around Earth is an ellipse, so it causes Earth to wobble. (B) The period of Earth's orbit is not an integer multiple of the period of Earth's rotation on its axis. (C) As other planets pass by Earth, they cause a continual decrease in Earth's orbital speed. (D) The period of Earth's orbit changes because its orbit is elliptical. (E) Friction due to tides causes Earth to rotate faster on its axis.

51. Why does our calendar usually include a leap year every four years? (A) The Moon's orbit around Earth is an ellipse, so it causes Earth to wobble. (B) The period of Earth's orbit is not an integer multiple of the period of Earth's rotation on its axis. (C) As other planets pass by Earth, they cause a continual decrease in Earth's orbital speed. (D) The period of Earth's orbit changes because its orbit is elliptical. (E) Friction due to tides causes Earth to rotate faster on its axis.

Applications and Investigations in Earth Science (9th Edition)
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
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PHYSICS TEST-Co 51. Why does our calendar usually include a leap year every four years? (A) The Moon's orbit around Earth is an ellipse, so it causes Earth to wobble. (B) The period of Earth's orbit is not an integer multiple of the period of Earth's rotation on its axis. (C) As other planets pass by Earth, they cause a continual decrease in Earth's orbital speed. (D) The period of Earth's orbit changes because its orbit is elliptical. (E) Friction due to tides causes Earth to rotate faster on its axis. In come designs for high cneed magnetigolly
Transcribed Image Text:PHYSICS TEST-Co 51. Why does our calendar usually include a leap year every four years? (A) The Moon's orbit around Earth is an ellipse, so it causes Earth to wobble. (B) The period of Earth's orbit is not an integer multiple of the period of Earth's rotation on its axis. (C) As other planets pass by Earth, they cause a continual decrease in Earth's orbital speed. (D) The period of Earth's orbit changes because its orbit is elliptical. (E) Friction due to tides causes Earth to rotate faster on its axis. In come designs for high cneed magnetigolly
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