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Add Earth, moon, and sun, then mix in the ocean.

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Add Earth, moon, and sun, then mix in the ocean. Tides and how they work By: Bianca Maddox – PowerPoint PPT presentation

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Title: Add Earth, moon, and sun, then mix in the ocean.


1
Add Earth, moon, and sun, then mix in the ocean.
  • Tides and how they work
  • By Bianca Maddox

2
What are Tides?
  • Tides are the rise and fall of the ocean. The
    force of tides affect objects on Earth, the
    atmosphere, and Earth itself. Tides are caused by
    the difference in strength of gravitational
    forces at different points on Earth. This
    involves the Earth, moon
    and the sun.

3
How Tides Work
  • Tides are caused by the moons gravitational
    force, which causes water to bulge on both sides
    of the Earth.

4
Gravitational Forces
  • The gravitational forces are the strongest for
    areas directly below the moon and on the opposite
    side of the Earth. The moons gravitational force
    causes the water to bulge on those sides of the
    Earth.

5
Lunar and Solar Tides
  • The sun has smaller tides than a lunar one. The
    moon and sun together will create spring and neap
    tides. Spring tides are very high and low tides,
    which occur when the Sun and Moon are on opposite
    sides of the
    Earth. Neap
    tides are the opposite.
    They are very low
    high tides and low low tides.

6
Diagram of Spring and Neap Tides
7
Bay of Fundy
  • The Bay of Fundy is a place were the highest
    tides occurs. The tides can raise up to 50 ft.
    The time between high and low tides is 6 hrs. and
    13 min. There are different phenomenon's for
    which the tides occur tidal bores, rapids, and
    horizontal tidal effects.

8
Tidal Bores at Fundy
  • Tidal bores are when tides meet. This creates
    three high waves and wild rapids. The tides can
    cause whirlpools, rapids, and tidal bores.

9
Horizontal tidal effects
  • Horizontal tidal effects cause the tide to sink
    back three miles. Since the bay is shallower and
    narrower near the upper part, the water rises
    higher.

10
Importance of measuring sea level
  • The importance of measuring sea level is to
    measure the height of everything on land. Mt.
    Everest is an example. It is also important
    because you know when the ocean is rising or
    falling, like for tides.

11

Measuring Sea Level
  • The sea level is measured by time gauges, which
    is a 1 ft. in diameter pipe with a small hole
    between the waterline. Satellites are used too.

12
Difficulty with measuring sea level
  • The difficulty with measuring sea level is the
    the sea is always moving. The water level is
    changed every second by waves, hours by tide,
    week by the change in orbit of the Earth and
    other planets, then by year because the ocean
    rises 2 mil per year.

13
Global Warming
  • Global warming is causing the temperature to
    rise. The temperature has risen 1/2 degrees C in
    the past 100 years. That is not the only thing
    that has risen, the sea level has rose 6 to 8
    inches in the last century.It is predicted that
    in 2100, the ocean will rise 50 cm.

14
Melting of Polar ice caps
  • The temperature rise is causing the icebergs to
    melt.
  • Icebergs are chunks of glaciers that have broke
    off.
  • The higher temperature is what is weakening the
    glaciers.

15
Melting Places
  • Antarctica carries 90 of the Worlds ice. If all
    the ice melted, ocean would rise 200 ft.
  • If North Pole melted, no change in sea level.
  • If Greenland melted, there would be a 20 ft
    increase in sea level.

16
Tidal Waves-Tsunami
  • Tidal waves are very high ocean waves that are
    caused by the sudden movement of water. Such as
    an underwater earthquake, undersea landslide, and
    a meteor or asteroid strike. Tidal wave is not a
    good expression since tides are caused by the
    moon and tsunami are caused by the sudden
    movements of the ocean. It is called tidal
    because it looks like tide that crashes as a
    large wave. Tsunamis can cause major damage and
    kill people.

17
Interest in tsunamis
  • Scientists interest measuring the large waves
    help understand structure and nature of the
    ocean.
  • Culture interest it has an impact on life for a
    long period of time.
  • Technology interest warning sensors systems help
    provide notice to when one is coming.

18
Indonesian Tsunami 2004
  • On December 31, 2004 a tsunami was caused by an
    undersea earthquake. This was the fourth largest
    earthquake in the world that measured a 9 on the
    Richter scale. The earthquake was caused by a
    tectonic plate sliding under another. The wave
    was 1200-1300 km in length and 100 km in width.

19
Picture of Tidal Wave Travel
20
About me
My name is Bianca Maddox, otherwise known as
Tonka. I love the roller coasters at Six Flags
like Batman, Superman and Ninja! Id ride them
forever!! And I like the 1980 Michael Jackson!
HEEHEE!
21
Bibliography
  • Conan-Danies,Richard.clearlyexplained.com/nature/
    earth/disaters/tsunamis.html
  • Flick, E. Reinhard. World Book Encyclopedia.
  • 2003
  • Hill, Alison. www.sfgate.com/getoutside/1996/
  • jun/tides.html.1996.
  • ____.Science.howstuffworks.com/question72.
  • htmurlhttp//rikers.ps.missouri.edu/
  • RICKSPAGE/MounlTides.html
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