Key – Study Guide Chapter 19. 1: Earth in Space Key Terms



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KEY – Study Guide - Chapter 19.1: Earth in Space
Key Terms:

  • Astronomy: The study of the moon, stars, and other objects in space.

  • Axis: The imaginary line that passes through Earth’s center and the North and South poles is the Earth’s axis.

  • Rotation: The spiraling of the Earth on its axis

  • Revolution: It is the movement of one object around another.

  • Solstice: The sun reaches its greatest distance north and south of the equator twice each year. Each of these days, when the sun is farthest north or south of the equator, is known as a solstice.

  • Equinox: An equinox occurs when the noon sun is directly overhead at the equator.


Focus Questions:

  1. Describe the Earth.

    1. Where is the equator located? 0 degrees

    2. Where is the northern and southern hemisphere?

      1. Northern Hemisphere: Tropic of Cancer (23.5° N)

      2. Southern Hemisphere: Tropic of Capricorn (23.5° S)

  2. In what hemisphere do we live? Northern Hemisphere: Tropic of Cancer (23.5° N)

  3. What are two major motions of Earth as it travels through space? Rotation and revolution

  4. What is the axis? The imaginary line that passes through Earth’s center and the North and South poles is the Earth’s axis.

  5. Define rotation. The spiraling of the Earth on its axis is called rotation

  6. How long does it take? It takes Earth about 24 hours to rotate once. Each rotation caused day and night.

  7. What is the relationship between day and night and the Earth’s rotation on its axis?



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