Earth and Season

Earth Motions and Tilt

Multiple Choice

What is the tide with the LEAST DIFFERENCE between high and low tide?

• Neap Tide

• Tides

• Lake

• Spring tide

Multiple Choice

Wobbling around the processional axis

• Revolution

• Tide

• Nutation

• Universe

Multiple Choice

What angle is earths tilt at

• 23.5

• 6

• 990

• 29.6

Multiple Choice

Keplers laws explained

• gravity

• planets motion

• mass

• medicine

Earth’s Circumference

• Erastosthenes determined the earth’s

circumference was 46,250 km

• At the equator = 40,074 km
• At the poles = 40,007 km

Earth’s Shape

• Oblate spheroid
• Spherical: slightly

flattened at the poles
and bulges at the
equator.

• As Earth rotates, the

sphere is distorted by
centrifugal force.
– Causes objects to move

outwards from the
center

– Greatest at the equator

Axis

• An imaginary line that runs through the

earth from the north pole to the south
pole.

• The earth rotates (spins) on its axis.

Tilt

• The earth is tilted at

23.5°

Coordinate system- a system of intersecting lines
used to determine locations on the Earth’s surface

Latitude

• Latitude: Measures distance North and South

of the Equator

• Parallels: imaginary lines that run E to W

Longitude

• Longitude: Measures distance in degrees east

and west of the Prime Meridian.

• Meridians: lines of longitude

Multiple Choice

Europe, Asia and North America are in what hemisphere?

• Northern

• Southern

• Western

• Eastern

Multiple Choice

What is the name of this line at 0 degrees latitude?

• Prime Meridian

• Equator

• North Pole

• South Pole

Multiple Choice

• The map show the lines of longitude.

• The map shows the lines of latitude.

Multiple Choice

The invisible line at 0 degrees longitude is called the _________.

• International Date Line

• Prime Meridian

• Equator

• Antarctic Circle

Multiple Choice

Latitude and Longitude lines are measured in __________.

• inches

• miles

• degrees

• ounces

Multiple Choice

To locate the exact places on Earth, one must look at: 

• latitude lines only

• the intersecting lines of latitude and longitude

• longitude lines only

• a neighboring area to describe the location

Earth’s Movement

• Rotation: spinning

motion of the earth.
24 hours for one
rotation (1 day).

• Revolution:

movement of the
earth around the sun.
365 1/4 days (1 year)

EARTH 'Movement Part 2

• Precession:The slight movement of Earth’s

axis over 26,000 years.

• Diurnal motion of stars: It is the motion of

the sky due to Earth's daily rotation. Stars
and other celestial bodies appear to move
from east to west. The axis of this apparent
motion coincides with Earth's axis of rotation.

•

Earth’s Movement Part 3

•Nutation

•–the wobble

•Change in the angle of the axis (1/2 degree)

Barycenter
•The point between two objects where they balance each other.

Reason #1: # of daylight hours

• The amount of sunlight varies throughout the

year. The tilt of the earth means no two
latitudes get the same amount each day.

• In the summer you have more hours of

sunlight and fewer in the winter.

Multiple Choice

Why do we experience the changing of the season on the earth?

• distance from the sun

• rotation of the earth

• change in solar output

• tilt of the earth's axix

Multiple Choice

What does the rotation of the earth cause us to experience?

• seasons

• year

• day & night

• eclipse

Multiple Choice

What season is when the north pole is tilted toward the sun?

• summer
• winter
• fall
• spring

Multiple Choice

When is the winter solstice?

• December

• June

• March

• September

Multiple Choice

Because of the direction that the Earth rotates on it's axis, what direction does the sun rise every day?

• north

• south

• east 

• west

Reason #2: Angle of sunlight

• The angle of the sun’s rays cause different

intensities, this is also caused by the tilt of the
earth.

Equinoxes

• Vernal Equinox: March 21-22
• Autumnal Equinox: Sept. 21-22
• 12 hours of daylight/12 hours of darkness
• The sun is directly overhead at the equator

Solstices

• Summer Solstice

– June 21-22
– Longest day of the year in the N. Hemisphere
– The sun is directly overhead at the Tropic of

Cancer.

• Winter Solstice

– December 21-22
– Shortest day of the year in the N. Hemisphere
– The sun is directly overhead at the Tropic of

Capricorn.