Vocabulary

1
Other Cycles
Daily Weekly Yearly
Earth and the Moon
Seasonal
Vocabulary
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A chain of events that happens over and over
again in the same order.
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A cycle
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The movement of one object around another object
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Revolution
The Earth is revolving around the Sun.
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A synonym for spin
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• Rotation

The Earth rotates on its axis.
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The different shapes of the moon
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• Moon phases

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The four natural divisions of the year
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Seasons
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The amount of time it takes the Earth to rotate
on its axis
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• 24 hours

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According to the diagram, is it day or night in
Texas?
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Day
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Occurs four times daily 2 high 2 low
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• Tides

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The amount of time it takes for a planet of
complete one orbit (revolution) around the Sun.
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• Year

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• What would happen if Earth started rotating at a
  slower speed?
• A day might be 20 hours long
• A day might be 22 hours long
• A day might be 24 hours long
• A day might be 26 hours long

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1. A day might be 26 hours long

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Approximately the amount of time it takes for the
Moon to complete one lunar cycle?
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• 28 days

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• Students recorded the different shapes of the
  Moon for a month. What causes the Moon to appear
  to change?
• Earth revolving around the Sun
• The Moon revolving around Earth
• The Moon moving away from Earth
• Earth spinning on its axis

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• B. The Moon revolving around the Earth
• To see the Earth and Moon in action go to
• http//web.educom.pt/pr1305/astros_terra.movimento
  s1.swf
• Be sure you click on the Activity tab

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• The moon causes which of the following cycles on
  Earth?
• Night and Day
• Tides
• Erosion
• Seasons

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• B. Tides

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• When the moon is seen from the Earth as a whole
  circle, it is called a-
• Crescent moon
• Full moon
• Half moon
• New moon

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Full Moon
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The same side of the Moon always faces Earth
TRUE or FALSE
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• TRUE
• Relative to the Earth, the Moon makes one
  rotation every 29.5 days. That happens to also be
  the time it takes for the Moon to complete one
  revolution around the Earth.

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The Seasons are caused by the varying distances
from the Sun. True or False
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False The Earth is always the same distance from
the Sun.
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• The angle at which the Suns rays strike parts of
  Earth changes the
• Daylight hours
• Seasons
• Time for a year
• Phases of the moon

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B. Seasons
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This diagram shows Earths many motions. Which
characteristic of Earth is responsible for the
cycle of seasons?
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The Earths TiltTo see the Earth in action, go
to http//web.educom.pt/pr1305/astros_terra.movim
entos1.swf Be sure you click on the Extension
tab
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• Which of the following is true about the suns
  rays hitting the Northern Hemisphere in winter?
• They hit less directly than in summer.
• They only hit at noon.
• They hit more directly than in summer.
• They hit for 24 hours each day.

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• A. They hit less directly than in summer.

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What is the season in Texas?
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• Winter
• The Northern Hemisphere is tilted away from the
  sun. Therefore, the Southern Hemisphere is
  getting the direct suns rays.

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The amount of time it takes a planet to spin
(rotate) once on its axis.

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A dayor24 hours
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Which of the following does not occur in
cycles? A. Lunar phases B. Tides C.
Gravity D. Seasons
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• Gravity

Gravity is the force that keeps the moon in orbit
around the Sun.
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• The moons orbit causes which of the following
  cycles on Earth?
• Night and day
• Tides and phases
• Eclipses and erosion
• Seasons

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• B. Tides and Phases

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What is the source of the moons light?
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• We see the reflection of the Suns rays.

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• What is the difference between Earth's rotation
  and revolution?
• Revolution refers to Earth's spinning on its
  axis, and rotation refers to Earth's changing
  seasons
• Rotation refers to Earth's spinning on its axis,
  and revolution refers to Earth's spinning around
  the Sun.
• Rotation refers to Earth's spinning on its
  equator, and revolution refers to Earth's
  spinning around the solar system.
• Revolution refers to Earth's spinning on its
  axis, and rotation refers to Earth's spinning
  around the Sun.

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Rotation refers to Earth's spinning on its axis,
and revolution refers to Earth's spinning around
the Sun. REMEMBER Earths rotation causes day
and night and one revolution of the Earth around
the Sun causes the year.
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Final Jeopardy
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Daily Double
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What cycle occurs more quickly?

1. Earths rotation
2. Earths revolution
3. Moons rotation
4. Moons revolution

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Earths Revolution
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Daily Double