Standard and Essential Question S6E2c. Relate the tilt of the earth to the distribution of sunlight throughout the year and its effect on climate. How does the tilt of the earth affect the seasons and Earth’s climate?

Standard and Essential Question https://www.youtube.com/watch?v=q4_-R1vnJyw&feature=youtu.be https://www.teachervision.com/winter/video/73032.html#prettyPhoto[flash]/0/ https://www.youtube.com/watch/?v=r-dtBfkzyl0

Tilt of the Axis- always points in the same direction

Standard and Essential Question S6E2c. Relate the tilt of the earth to the distribution of sunlight throughout the year and its effect on climate. How does the tilt of the earth affect the seasons and Earth’s climate?

The Seasons What is the difference between rotation and revolution ? What causes the earth’s seasons ? What is the position of earth during each season? How does Earth’s tilt cause temperature differences in the seasons ?

Rotation vs. Revolution

The Earth’s Axis The axis always points to the star Polaris.

Rotation vs. Revolution

Rotation Rotation: The Earth makes one complete rotation in 24 hours. Causes us to have day and night.

Rotation Animation: http://www.learner.org/jnorth/images/graphics/mclass/SunlightAnimation_Year.gif

Revolution Revolution: An object traveling on a path around another object. The Earth traveling around the sun. The Earth REVOLVES around the sun One revolution takes approximately 365 days ( 1 year) The Earth’s revolution around the sun is why we have years and seasons. In the box on your notes, draw the Earth revolving around the sun.

What causes the Earth’s Seasons ?

What causes the Earth’s Seasons ? The earth is divided by the equator into two halves called hemispheres ( North and South) http://www.fengshuiweb.co.uk/advice/hemisphere.htm

What causes the Earth’s Seasons ? Earth’s orbit + the way that the Earth tilts on its axis causes the seasons. The sun’s rays strike Earth unevenly- at different angles at different times of the year

Position of Earth The seasons are always opposite in Earth’s Northern and Southern Hemispheres.

Position of Earth Summer: the hemisphere pointing towards the sun. Winter: in the hemisphere pointing away from the sun. Fall/Spring: when both hemispheres are facing the sun equally.

Position of Earth Northern Hemisphere tilts towards the sun= summer in N. Hemisphere winter in S. Hemisphere Southern Hemisphere tilts towards the sun= summer in Southern Hemisphere winter in Northern Hemisphere

Position of Earth Two points where axis is not tilted away or toward the sun. These points mark the beginning of fall and spring Fall in Northern Hemisphere, Spring in Southern Hemisphere Spring in Northern Hemisphere, Fall in Southern Hemisphere

Position of Earth When it is fall in the Northern Hemisphere, what season is in the Southern Hemisphere? When it is winter in the Northern Hemisphere, what season is in the Southern Hemisphere? When it is spring in the Northern hemisphere, what season is it in the Southern hemisphere? When it is fall in the Southern Hemisphere, what season is it in the Northern Hemisphere?

Opposite Seasons www.skepticalscience.com -

Fill in the blank for what season it would be in the southern hemisphere. Northern Hemisphere Spring Summer Fall Winter Southern Hemisphere The seasons are always opposite in Earth’s Northern and Southern Hemispheres.

What causes the Earth’s Seasons ? physics.weber.edu

What causes the Earth’s Seasons ? web.gccaz.edu

Flashlight Activity The sun’s rays deliver the most energy when Direct

What causes the Earth’s Seasons ? en.allexperts.com

What causes the Earth’s Seasons ? http://wieting.tamatoledo.com/sites/Files/wieting/u121/seasons.jpg

Position of Earth September 22 or 23 December 21 or 22 June 21 or 22 www.examiner.com March 20 or 21

Position of Earth ` www.examiner.com

What causes the Earth’s Seasons ? Cnx.org

Temperature and Daylight The sun’s rays deliver the most energy when Direct

Temperature and Daylight During Winter, sunlight is Less direct, meaning the area receives less Energy from the sun During Summer, sunlight is More direct, meaning the area receives more Energy from the sun

Flashlight Activity The sun’s rays deliver the most energy when Direct http://www.astronomy.org/programs/seasons/ The sun’s rays deliver the most energy when Direct

Temperature and Daylight The amount of daylight also changes with the seasons.

Temperature and Daylight The amount of daylight also changes with the seasons. In the Northern Hemisphere, from Dec. 21st to June 21st the period of daylight gets longer, from June 21 to Dec. 21st, the period of daylight gets shorter

Temperature and Daylight frontierbushcraft.com

Temperature and Daylight The amount of daylight also changes with the seasons. Summer More hours of daylight Sun Heats surface longer Temperatures higher Winter Less hours of daylight Sun heats surface for a shorter amount of time Temperatures lower

Temperature and Daylight The amount of daylight also changes with the seasons.

Exceptions to the Seasons Many parts of the earth do not have distinct seasons Places near the equator: receive direct sunlight all year long, so temperatures remain high The north and south poles: get less direct sunlight from farther poles, so even in summer, these places are still cold.

Exceptions to the Seasons Climate: average, year-after-year conditions of temperature, precipitation of an area. Influenced by latituide, ocean currents, near land/water.

Exceptions to the Seasons 3 temperature zones: Tropical zone: around equator, extending to 23.5*N and 23.5*S. Warm climate because direct sunlight all year round. Polar zones: near poles from 66.5*-90*S and 66.5*-90* N cold climate b/c receives sunlight at an angle. Temperate Zones: weather that ranges from warm in summer to cold in winter. Between 23.5 & 66.5.

Exceptions to the Seasons Marine climates: warm winters and cool summers because large bodies of water cool down slowly and heat up slowly. * also because of ocean currents. Continental climates: cold winters and hot summers b/c no water.

Exceptions to the Seasons Seasons change as the amount of energy that each hemisphere receives from the sun changes.