earth, moon & sun seasons & tides. essential standards 6.e.1understand the earth/moon/sun...
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Earth, Moon & Sun
Seasons & Tides
Essential Standards
• 6.E.1Understand the earth/moon/sun system, and the properties, structures and predictable motions of celestial bodies in the Universe.
Clarifying Objectives
• 6.E.1.1 Explain how the relative motion and relative position of the sun, Earth and moon affect the seasons, tides, phases of the moon, and eclipses.
Essential Questions
• Why do we have seasons?
• How does gravitational pull & location of the sun, moon & Earth affect the ocean tides?
Earth’s Seasons• The Earth has 4 seasons
– Summer– Winter– Autumn– Spring
• THE EARTH HAS SEASONS BECAUSE OF ITS TILT ON ITS AXIS
• The Earth is tilted at 23.5 degrees
Northern Hemisphere vs. Southern Hemisphere
• Northern Hemisphere is the part of the Earth that is above the Equator
• The Southern Hemisphere is the part of the Earth that is below the Equator
Northern Hemisphere vs. Southern Hemisphere
• The closer you are to the Equator the less you will see season changes
• The farther you are (North & South Pole) the more you will notice season changes
Seasons are Opposite
• Seasons are opposites in the Northern & Southern Hemispheres
• The opposite seasons are– Summer/– Spring/Autumn (Fall)
Direct Sunlight vs. Indirect Sunlight• When a place on the Earth
is receiving DIRECT SUNLIGHT it will be warmer meaning it will be SUMMER
• When a place on the Earth is receiving INDIRECT SUNLIGHT it will be colder meaning it will be WINTER
• http://www.youtube.com/watch?v=Pgq0LThW7QA
• 3:16-4:50
Seasons are Opposite• For example if it is
summer above the equator (Northern Hemisphere) it will be winter below the equator (Southern Hemisphere)
• Another example Autumn (Fall) above the equator/Spring below the equator
Why Do We Have Seasons• Seasons exist because
EARTH IS TILTED on it’s AXIS
• The TILT on the Earth’s AXIS allows different parts of the Earth to receive more DIRECT sunlight
• This allows the sun to hit at DIFFERENT ANGLES of the WORLD
• http://www.youtube.com/watch?v=3eFqZWX8nTo
• 0:00-2:00
Seasons Model
• http://www.youtube.com/watch?v=85jkZE2_oNg
• http://www.youtube.com/watch?v=Pgq0LThW7QA
• 2:03-
Essential Question??
• Get with a partner or group and answer…
• Why do we have seasons?
Earth’s Tides
• A TIDE is a rising and falling of the sea that happens 2 times per day
• There are 2 types of tides– High Tide– Low Tide
• http://www.youtube.com/watch?v=OP0cpXpw8yk
Location of the Moon & Earth• Tides depend on the location
of the moon & Earth
• When the moon is directly over North America it will have High Tide
• When the moon is directly on the opposite side of North America it will be low tide
High Tide
• High tide happens twice a day
• It happens when the moon is directly above that spot on the earth
• It also happens when the moon is directly below that spot on the earth
• http://www.youtube.com/watch?v=Ead8d9wVDTQ
Low Tide
• Low tide happens twice a day
• It happens when the spot being observed is at right angles to the moon
• http://www.youtube.com/watch?v=Ead8d9wVDTQ
What Causes Tides?
• Tides are caused by ① Moons Gravitational
Force② Inertial Force
Gravitational Force Pulls
• Gravitational pull from the Moon causes water to rise above the land mass
• This is called an ordinary High Tide
• http://www.youtube.com/watch?v=ojPpxAT7Bh4
• 1:18-1:57
Inertial Force
• Inertial Force causes the second high tide on the back side of the moon
• This is called a Counter High Tide
• http://www.youtube.com/watch?v=ojPpxAT7Bh4
• 1:18-1:57
Essential Question
• Please get with a partner and answer….
• How does gravitational pull & location of the sun, moon & Earth affect the ocean tides?
EOG Questions• Why does Earth have different seasons?
• A) because of the distance between Earth and the sun
• B) because of the speed of Earth as it rotates on its axis
• C) because of the amount of light blocked by the moon on its axis
• D) because of the tilt of Earth on its axis as it moves around the sun
Important Points• Seasons occur because the
Earth is TILTED on it’s AXIS
• Seasons are opposite from North to South of the equator
• Tides are when the ocean rises and falls
• High Tide & Low Tide happens 2 times per day each
• Ordinary Tides happen because of the Gravitational Force of the moon
• Counter High Tides happen because of Inertial Force
• If a tide is not in High tide it is in Low Tide
• Tides depend on the position of the MOON & EARTH
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