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Sun-Earth-Moon System

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Sun-Earth-Moon System Ch 20 ... – PowerPoint PPT presentation

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Title: Sun-Earth-Moon System


1
Sun-Earth-Moon System
  • Ch 20

2
Section 1 Earths Motion
  • Earth and Sun
  • A) Earth is ALWAYS moving (even though we dont
    feel it)
  • B) Around the Sun
  • 1) Nearest star 150 million km
  • away from Earth
  • 2) 100 times bigger than Earth
  • 3) Mass is 300,000 times greater
  • 4) Inside Sun
  • Nuclear Fusion nuclei of atoms
  • combine releasing HUGE amounts
    of
  • energy!
  • SMALL part (of Suns
    energy) reaches
  • EARTH!

3
Sect. 1 Cont.
  • C) Earths movement around Sun
  • 1) Revolution motion of one object around
    another object.
  • 2) Orbit the path an object follows as it
    moves around another object.
  • Earths path is not a perfect circle (close
    but not quite) ellipse.
  • 3) 365.24 days (Know why we have leap year??
    Make up for that .24!!)
  • 4) Earth revolves around Sun because of SUNs
    GRAVITY pulls on Earth.
  • 5) Demo ball on string

4
Sect. 1 Cont.
  • D) Earth ROTATES on its axis.
  • 1) Causes day (part of Earth facing Sun) and
    night (part of Earth away from Sun)!
  • 2) Rotation is spinning motion.
  • 3) Rotation axis line on which an object
    rotates.
  • 4) Rotates COUNTERCLOCK wise.

5
Sect. 1 Cont.
  • 5) Earth rotates from WEST to EAST causing
  • Sun / stars / moon to appear to move from East
    to West.
  • 6) Earths axis is tilted sometimes tilted
    toward Sun sometimes away.

6
Sect. 1 Cont.
  • II)Shape of Earth
  • A) Sphere causes different parts to receive
    different amounts of Suns energy.
  • Equator
  • - more direct Sunlight /warmer
  • (receives more energy)
  • Northern / Southern Hemisphere
  • - more spread out / colder
  • (receives less energy)

7
Sect. 1 Cont.
  • B) Earth is Tilted 23.5 degrees
  • INFLUENCES our SEASONS!
  • III) Seasons
  • A) Cause of Seasons combination of
  • 1) TILT !!!
  • 2) Revolving around SUN
  • 3) REMEMBER
  • CLOSEST to Sun in WINTER
  • FARTHEST to Sun in SUMMER
  • TILT is what makes us warmer or
  • cooler!

http//www.youtube.com/watch?vDuiQvPLWziQ
8
Sect. 1 Cont.
  • B) Solstice (Def day when Earths rotation axis
    is the most toward or away from the sun)
  • 1) December Solstice (Winter for us)
  • Northern Hemisphere shortest day and longest
    night. (Tilted AWAY from Sun)
  • Southern Hemisphere longest day and shortest
    night. (Tilted TOWARD Sun)

9
Sect. 1 Seasons Cont.
  • 2) June Solstice (Summer for us)
  • Northern Hemisphere is tilted TOWARD Sun.
  • - Longest day and shortest night.
  • Southern Hemisphere is tilted AWAY from Sun.
    (Their winter)
  • - Shortest day and longest night.

10
Sect. 1 Seasons Cont.
  • C) Equinox (Def day when Earths rotation axis
    is leaning along Earths orbit neither toward nor
    away from Sun.)
  • 1) September Equinox
  • Northern Hemisphere Fall
  • 12 hours day and night.
  • Southern Hemisphere Spring
  • 2) March Equinox
  • Northern Hemisphere Spring
  • 12 hours day and night
  • Southern Hemisphere Fall

11
Websites
  • Teachers Domain seasons
  • There is a tutorial on the book website too.

12
End Sect. 1
  • Assignment
  • Worksheets yes due tomorrow!

13
Sect. 2 The MOON
  • Moon info
  • Formation
  • Shortly after Earth formed Mars size planet hit
    Earth.
  • Sent vaporized rock into ring around Earth.
  • Eventually, formed into our Moon.

14
I) Moon Info cont.
  • B) Surface No atmosphere or liquid water or
    plate tectonics to change surface.
  • Craters - bowl shaped dip from space objects
    crashing into the Moon.
  • Maria dark flat areas that formed from lava
    hardening.
  • Highlands light colored areas w/ craters (too
    high for the lava to cover so no maria there)
    oldest area on moon.
  • Rays bright streaks around craters.

15
I) Moons Info. Cont.
  • C) Moons Motion
  • 1) Revolves around Earth in 27.3 days
    gravitational pull of Earth on Moon.
  • 2) Rotates counterclockwise around in 27.3 days
    means
  • 3) IMPORTANT same side of Moon faces Earth at
    all times!!!
  • Side we see NEAR side
  • Side we do not see FAR side

16
II) Phases of Moon
  • Phases portion of Moon lit up by Sun (part we
    see some planets also have phases).
  • Waxing Phases increasing light on Moon
  • (DRAW!!) Right side lit up
  • Waxing Crescent
  • 1st Quarter
  • Waxing Gibbous
  • Full Moon
  • Moon Earth Sun in a line

17
II) Phases Cont.
  • B) Waning Phases light is decreasing
  • Left side lit up
  • Waning Gibbous
  • 3rd Quarter or Last
  • Waning Crescent
  • New Moon
  • No light Earth Moon Sun in a line

18
Website
19
Assignment
  • Worksheets

20
Sect. 3 Eclipses and Tides
  • Eclipses produced by shadows of Earth or Moon.
  • Parts of a shadow
  • Umbra
  • Darkest part of a shadow
  • In the center or middle
  • Penumbra
  • Lighter part of a shadow (light is partially
    blocked.
  • On the sides or outside of the umbra

21
I) Eclipses cont.
  • B) Solar Eclipse
  • 1) Def Moons shadow appears on Earths
    surface.
  • 2) Position Earth Moon Sun (New Moon
    Phase)
  • 3) Total occurs only for those in Umbra.
  • 4) Partial occurs for those in Penumbra.
  • 5) Why dont we have one every New Moon?
  • Moons orbit is tilted about 5 degrees from
    Earths orbit so they rarely line up for Solar
    Eclipse.

22
Website
  • http//www.teachersdomain.org/asset/ess05_vid_tota
    leclipse/
  • How many people see a solar eclipse?
  • Very few Moons shadow is small compared to
    Earth.

23
I) Eclipses cont.
  • C) Lunar Eclipse
  • 1) Def Moon moves into Earths shadow.
  • 2) Position Sun, Earth, Moon in a line can
    ONLY occur during Full Moon.
  • 3) Total and Partial occur.
  • 4) Again doesnt happen every full moon due to
    Moons orbit

24
Website
  • http//www.youtube.com/watch?vIKQkM474UE0feature
    related
  • How many people can see a lunar eclipse?
  • Anyone on Earth who can see the moon more than
    can see a solar eclipse.
  • How often can one occur?
  • About every 6 months.

25
II) Tides
  • Def
  • Daily rise and fall of sea level.
  • Bulges of Earths Oceans.
  • P. 748 Figure 20 High Low Tide
  • Happens twice each day.
  • C) Cause
  • Moons gravitational pull on Earth.
  • Suns gravitational pull has a smaller effect
    causes special ones

26
II) Tides cont.
  • D) where Moon Suns grav. work together.
  • 1) Spring Tides Full New Moon phase E, M, S
    lined up.
  • HIGH tides are higher than usual.
  • LOW tides are lower than usual.
  • 2) Neap Tides S, E, M form a right angle (90
    deg.)
  • HIGH tides are lower than usual.
  • LOW tides are higher than usual.
  • (P. 748 Fig. 21 bottom of page)

27
Finished Chapter Whew!
  • Review assignment
  • P. 753 Copy and do Concept Map (8-15)
  • P. 754 (1-10 Multiple Choice)
  • P. 755 SENTENCES!! (14, 16, 17)
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