WHAT ARE THE SOURCES OF ENERGY ON COASTS? Rivers deliver sediment to the oceans. How are they distributed and how can the oceans cause erosion?

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Presentation transcript:

WHAT ARE THE SOURCES OF ENERGY ON COASTS? Rivers deliver sediment to the oceans. How are they distributed and how can the oceans cause erosion?

WHAT ARE THE SOURCES OF ENERGY ON COASTS? 1. Tides

WHAT ARE THE SOURCES OF ENERGY ON COASTS? 1. Tides 2.Waves

WHAT ARE THE SOURCES OF ENERGY ON COASTS? 1. Tides 2.Waves 3.Surges

WHAT ARE THE SOURCES OF ENERGY ON COASTS? 1. Tides 2.Waves 3.Surges 4.Tsunamis

WHAT ARE THE SOURCES OF ENERGY ON COASTS? 1. Tides* 2.Waves* 3.Surges 4.Tsunamis

How do Tides Work? N 363,104 km (225,622 mi) 406,696 km (252,622 mi)

How do Tides Work? N 363,104 km (225,622 mi) 406,696 km (252,622 mi) Earth Moon If Earth was not also revolving around the Sun, the moon would take 27.3 day complete a revolution. As the Earth is moving it actually takes 29.5 days.

Earth Moon N S Sun 5°

Earth covered in Oceans.

Moon Line of maximum gravitational pull

Ocean waters on this side pulled towards line.

Ocean waters on this side pulled towards line.

Ocean waters “shallower” than average. Low tide.

Ocean waters “deeper” than average. High tide.

Time 0 hours Earth’s Rotation

Time +3 hrs.

Time +6 hrs

Time +9 hrs

Time +12 hrs.

Time +15 hrs.

Time +18 hrs.

Time +21 hrs.

Time +24 hrs. High Tide High Tide High Tide Low Tide Low Tide

Earth’s Revolution around the Sun Approximately one month A twelfth of a full revolution 15° of a circle

Earth’s Revolution around the Sun Moon’s Revolution around the Earth. Day 1

Earth’s Revolution around the Sun Moon’s Revolution around the Earth. Day 1 Day 7

Earth’s Revolution around the Sun Moon’s Revolution around the Earth. Day 1 Day 7 Day 15

Earth’s Revolution around the Sun Moon’s Revolution around the Earth. Day 1 Day 7 Day 15 Day 22

Earth’s Revolution around the Sun Moon’s Revolution around the Earth. Day 1 Day 7 Day 15 Day 22 Day 29

Moon’s gravitational pull on the Earth

Sun’s gravitational pull on the Earth. Weaker because of distance, despite large mass.

Sun and Moon’s gravitational pull in SAME direction.

Sun’s gravitational pull on the Earth. Weaker because of distance, despite large mass. Sun and Moon’s gravitational pull in SAME direction. Sun and Moon’s gravitational pull OPPOSED.

Sun’s gravitational pull on the Earth. Weaker because of distance, despite large mass. Sun and Moon’s gravitational pull in SAME direction. Sun and Moon’s gravitational pull OPPOSED. SAME

Sun’s gravitational pull on the Earth. Weaker because of distance, despite large mass. Sun and Moon’s gravitational pull in SAME direction. Sun and Moon’s gravitational pull OPPOSED. SAME OPPOSED

Sun’s gravitational pull on the Earth. Weaker because of distance, despite large mass. Sun and Moon’s gravitational pull in SAME direction. Sun and Moon’s gravitational pull OPPOSED. SAME OPPOSED

Sun and Moon’s gravitational pull in SAME direction. Sun and Moon’s gravitational pull OPPOSED. SAME OPPOSED Full Moon Entire lighted portion visible from Earth

Sun and Moon’s gravitational pull in SAME direction. Sun and Moon’s gravitational pull OPPOSED. SAME OPPOSED Half Moon Only half of lighted portion visible from Earth

Sun and Moon’s gravitational pull in SAME direction. Sun and Moon’s gravitational pull OPPOSED. SAME OPPOSED New Moon Lighted portion invisible from Earth

Sun and Moon’s gravitational pull in SAME direction. Sun and Moon’s gravitational pull OPPOSED. SAME OPPOSED Half Moon Only half of lighted portion visible from Earth

Sun and Moon’s gravitational pull in SAME direction. Sun and Moon’s gravitational pull OPPOSED. SAME OPPOSED Full Moon Entire lighted portion visible from Earth

SAME OPPOSED SAME OPPOSED What we see from Earth “Waning” Moon “Waxing” Moon Full Half Full New

SAME OPPOSED SAME OPPOSED Impact of Sun on the strength of Moon’s tidal pull

SAME OPPOSED SAME OPPOSED Impact of Sun on the strength of Moon’s tidal pull ENHANCE

SAME OPPOSED SAME OPPOSED Impact of Sun on the strength of Moon’s tidal pull ENHANCE Weaken

SAME OPPOSED SAME OPPOSED Impact of Sun on the strength of Moon’s tidal pull ENHANCE Weaken

SAME OPPOSED SAME OPPOSED Impact of Sun on the strength of Moon’s tidal pull Weaken ENHANCE Weaken

SAME OPPOSED SAME OPPOSED Impact of Sun on the strength of Moon’s tidal pull Weaken ENHANCE Weaken

Low Tide Level High Tide Level

High tide Low tide