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Tides. Oregon Coast. Tides. Tides are NOT created by Wind . Tides are created by gravitational attraction of the Earth and the Moon and the Earth and the Sun . High tide= elevation of Earth’s water is high Low tide= elevation of Earths water is low. Monthly Cycles: Spring and Neap Tides.

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Presentation Transcript
tides

Tides

Oregon Coast

tides1

Tides

Tides are NOT created by Wind.

Tides are created bygravitational attractionof the Earth and the Moon and the Earth and the Sun.

slide3

High tide= elevation of Earth’s water is high

  • Low tide= elevation of Earths water is low
monthly cycles spring and neap tides
Monthly Cycles: Spring and Neap Tides

Neap tides The smal-lest range of tidal ele-vation. Neap tides occur around first and third quarters of the lunar cycle.

Spring tides

The greatest range of tidal eleva-tion during the month. Spring tides occur around full and new moons.

Spring Tide

Neap Tide

why tides occur
Why tides occur
  • Together, the gravitational pull of the moon and the sun affect the Earth’s tides on a monthly basis.
  • When the sun, moon, and Earth are in alignment (at the time of the new or full moon), the solar tide has an additive effect on the lunar tide, creating extra-high high tides, and very low, low tides — both commonly called spring tides.
  • One week later, when the sun and moon are at right angles to each other, the solar tide partially cancels out the lunar tide and produces moderate tides known as neap tides.
  • During each lunar month, two sets of spring and two sets of neap tides occur.
how often do tides occur
How often do tides occur?
  • High tides and low tides occur twice a day in most areas.
  • Spring tides and Neap tides occur twice a month.
1 surfs up
1. Surfs up

Left side:

  • You and your surfboard are looking for an awesome wave to catch.
  • Pretend that it was a first quarter moon on July 1st.
  • Give what time of day and day of the month would have the most bodacious waves.
  • Is this neap, spring, or neither tide?

PreAP

2 sand castles
2. Sand castles
  • You are entering a sand castle contest for a 1 b’jillion dollar prize. The best sand castles are made on the wet sand at low tide.
  • Pretend that it was a new moon on August 1st.

1. Give best date and time to build this sand castle.

2. Is this neap, spring, or neither tide?

PreAP

1 surfs up1
1. Surfs up

Left side:

  • You and your surfboard are looking for an awesome wave to catch.
  • Pretend that it was a new moon.
  • Give what time of day has the most bodacious waves.
  • Is this neap, spring, or neither tide?

R

2 sand castles1
2. Sand castles
  • You are entering a sand castle contest for a 1 b’jillion dollar prize. The best sand castles are made on the wet sand at low tide.
  • Pretend that it was a 3rd quarter moon.

1. Give best time to build this sand castle.

2. Is this neap, spring, or inbetweentide?

R