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Tides

Tides. http://lh6.ggpht.com/-PBJ6cE_i5Nc/T2WyKwTRr4I/AAAAAAAAVdU/GEZNXyatAr8/fundy-tides-comparison%25255B4%25255D.jpg?imgmax=800. What Are Tides?. Tides are the daily rise and fall of Earth’s waters on its coastlines.

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Tides

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  1. Tides http://lh6.ggpht.com/-PBJ6cE_i5Nc/T2WyKwTRr4I/AAAAAAAAVdU/GEZNXyatAr8/fundy-tides-comparison%25255B4%25255D.jpg?imgmax=800

  2. What Are Tides? • Tides are the daily rise and fall of Earth’s waters on its coastlines. • As the tide comes in, the level of water on the beach rises, and as the tide goes out, the level of water on the beach goes down. • Tides occur in all bodies of water, but they are most noticeable in the ocean and large lakes.

  3. High Tides • High tides are when the water reaches its highest point.

  4. Low Tides • Low tides are when the water reaches its lowest point.

  5. Bay of FundyNew Brunswick, Canada

  6. High Tide Low Tide 6

  7. What Causes High and Low Tides?

  8. What Causes Tides? • Tides are caused by the interaction of Earth, the Moon, and the Sun. • Gravity is the reason for tides. https://tallbloke.files.wordpress.com/2012/05/sun-earth-moon.jpg

  9. m M Newton’s Universal Law of Gravitation • All objects attract or pull on each other with an invisible force without contact • The pull of gravity between 2 objects depends on their masses and distancebetween them • The bigger the objects the greater theattraction • Gravity gets weaker as distance gets bigger D

  10. Moon’s Gravity and Tides • The Moon’s gravity affects the water on Earth’s surface. • Since the Moon is close to the Earth, it has a strong gravitational pull on it (closer objects have stronger gravitational pull).

  11. Moon’s Gravity – Tidal Bulges • The Moon pulls on the water on the side nearest to it more strongly than it pulls on the center of the Earth. • This pull creates a bulge of water, called a tidal bulge, on the side of Earth facing the Moon.

  12. Moon’s Gravity – Tidal Bulges • The water on the side of Earth facing away from the Moon has a less strong pull. • This water is “left behind” and forms a second bulge. • As Earth rotates, different places on the planet’s surface pass through the areas of the tidal bulges and have a change in water levels.

  13. Tidal Bulges – High Tide • In places where there are tidal bulges, high tide is occurring along the coastlines. High Tide High Tide

  14. Tidal Bulges – Low Tide • In places between the bulges, low tide is occurring. LOW TIDE LOW TIDE

  15. Sun’s Gravity and Tides • The Sun is so largethat its gravity also affects tides. • At times, the Sun and Moon pull together on Earth’s waters in the same direction. • At other times they pull in differentdirections.

  16. Monthly Tide Cycle • Changes in the positions of Earth, the Moon, and Sun affect the height of tides during a month.

  17. Spring Tides • Spring tides occur 2 times a month, during a full and new moon when the Earth, Sun, and Moon are lined up. • Spring tides are higher and lower than normal tides. • Large tidal range

  18. Neap Tides • Neap tides occur at the firstquarter Moon and thirdquarter Moon, when the Sun and Moon pull at right angles to the Earth. • Neap tides are not as high or low as normal tides. http://www.enchantedlearning.com/tgifs/Tideneap.GIF

  19. Animation First Quarter Moon Third Quarter Moon https://www.windows2universe.org/earth/Water/images/tides_lg.gif

  20. Webquest Linkhttp://www.schenectady.k12.ny.us/users/title3/future%20grant%20projects/Projects/Tides/tideshunt.htm

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