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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