TEK 8.7C Relate the position of the Moon and Sun to their effect on ocean tides. The Earth in Space

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1 TEK 8.7C Relate the position of the Moon and Sun to their effect on ocean tides The Earth in Space

2 But first let s review!

3

4 Name this phase! Full Moon

5 Name this phase! First Quarter

6 Name this phase! Waxing Crescent

7 Name this phase! Waning Gibbous

8 Name this phase! Third Quarter

9 Name this phase! Waxing Gibbous

10 Name this phase! Waning Crescent

11 Name this phase! Full Moon

12 Name this phase! New Moon

13 Name this phase! Waning Gibbous

14 Name this phase! Waning Crescent

15 Mr. Lee Moon Phase Rap

16 Ocean Tides Lunar Eclipses

17 Eclipses The Sun and Moon occasionally line up causing an eclipse Two types of Eclipses: Solar Eclipse Lunar Eclipse Eclipses are named for which object is blocked from our view on Earth

18 Moon moves between the Earth and Sun The Moon s shadow covers part of the Earth Only happens during a New Moon Total eclipses are rare occurrences

19

20 Total Solar Eclipse Observers in the umbra shadow see a total eclipse (safe to view the Sun) Those in penumbra see a partial eclipse (NOT safe to look directly at Sun) Only lasts a few minutes Path of Totality about 10,000 miles long, only 100 miles wide

21 Words to Know Umbra the darkest part of the shadow during an eclipse (people in the umbra will see a total eclipse)

22 Words to Know Penumbra - the lighter part of the shadow during an eclipse (people in the penumbra will see a partial eclipse)

23 Photo of a Total Eclipse

24 Partial Solar Eclipse

25 Earth moves between the Sun and the Moon Moon is in Earth s shadow this shadow darkens the moon Can only occur at a Full Moon About 2-3 lunar eclipses per year Last up to 4 hours

26

27 Lunar Eclipse

28 Checkpoint Why do lunar eclipses occur only during a Full Moon? Where are the Earth, the Sun, and the Moon located in relation to each other during a lunar eclipse? Answer: Earth must come between the sun and the moon during a lunar eclipse; this only happens during the full moon phase.

29 Tides The rise and fall of water, every 12.5 hours The water rises for about 6 hours, then falls for about six hours, in a regular cycle Two high tides and two low tides every day Tides Animation

30 The Tides Tides are caused by the pull of Moon s gravity on Earth We have both low tides and high tides

31 High tide: occurs in areas where side is facing Moon and the side away from Moon Also called Spring Tides

32 Low tide: occurs on sides of Earth Also called Neap Tides

33 The Moon s Gravity The Moon s gravity tugs on the Earth Tides occur mainly because of differences in how much the moon pulls on different parts of the Earth It pulls the most on the part of Earth closest, which raises the atmosphere, the oceans, and even the rocks (a little) Moon s gravitational pull It pulls the least on the part of Earth that s farthest away

34 High Tides and the Tide Cycle As Earth rotates, one high tide stays on the side of Earth facing the moon The second high tide stays on the opposite side of Earth Every location on Earth sweeps through those two high tides and two low tides in a 25-hour cycle

35 Tides and the Lunar Cycle During New and Full Moon - Spring Tides greatest difference between high and low tide During First and Last Quarter - Neap Tides least difference between high and low tide

36

37 Spring Tide or High Tide The sun s gravity also pulls on Earth s waters During a New and Full moon - the Sun, Earth, and moon are nearly in a line (parallel) The gravity of the sun and the moon pull in the same direction The combined forces produce a tide with the greatest difference between low and high tide Spring Tides occur twice a month

38

39 Neap Tides or Low Tides During First and Last Quarter moons - the line between the Sun, Earth, and moon is a right angle The sun s pull is at right angles to the moon s This arrangement produces a tide with the least difference between low and high tide

40

41 Tidal Forces on Earth

42

43 Bay of Fundy Observations Bay of Fundy January 24, 2011 Bay of Fundy Video Ocean Tides at the Bay of Fundy

44 Bay of Fundy Observations January 24, 2011

45 Local Tide Effects The shapes of bays, inlets, and the ocean floor can affect the flow of water, so that the height and timing of the tides can vary even in places that are close to each other

46 The positions of the moon, Earth, and the Sun cause the phases of the moon, eclipses, and tides

47 Worksheet

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