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### 19 Cards in this Set

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 Earth's Shape? oblate Spheroid How do ships show Earth's shape? while travelling, the bow of the ship disappears over the horizon first. If the earth was flat, the whole ship would leave the range of sight at the same time. How do stars show Earth's shape? as you move farther north or south, stars appear lower in the sky. Polaris is also called the north star Formula of gravity Force = (Mass 1 x Mass 2) / distance^2 When leaving the force of Earth's gravity your ________ changes but your ________ stays the same. weight mass How does earth shape affect the force of gravity? _ Eratosthenes Experiment: (formula) angle/360 = distance on the surface/circumference What was the purpose of Eratosthenes Experiment? To determine the Earth's size 3 basic layers of earth The lithosphere, the hydrosphere, the atmosphere lithosphere rock layer (litho means rock) Hydrosphere water layer atmosphere gas layer Topographic maps scale model of the earth's surface; used to show the three-dimensional features of the surface Field Maps a region of space with a measurable quantity at every point. A field map is commonly used to show pressure, temperature or elevation. isolines lines connecting areas of = value isobars lines connecting areas of = Pressure isotherms lines connecting areas of = temperature As the lines are drawn closer to each other, the gradient _____________. increases