AIM: Explain the cause and main characteristics of the

seasons globally?

OBJ: Given notes and activity sheet SWBAT explain the cause and main characteristics of the seasons globally with 70% accuracy

DN: Watch Seasons Video https://www.youtube.com/watch?v=F1nL_M1G1Xw

HW check

ACT: Introduction to Seasons: Cause and Characteristics (notes); Work on eSpark Assignment

HW: Complete What Causes the Seasons? Activity Sheet; Pastrami Exam, Dec. 19; Earth Science, January

The SeasonsWhy equator hot and poles cold?

Weather: due to the uneven heating of the earth’s surface

Direct rays

Indirect rays

Indirect rays

Heat energy spread outcooling effect

Heat energyconcentrated

Heat energy spread outcooling effect

The SeasonsSeasons: winter, spring, summer, fall (autumn);

changes in precipitation and temperature during the year.

Cause of the Seasons: tilt of the earth’s axis

Earth’s Tilt: 23.5° from vertical

0° tilt: spring, fall only

23.5° tilt: moderate temperatures

winter (cold), spring, summer (warm), fall

35°- 45° tilt: extreme temperatures

winter (v. cold), spring, summer (v. hot), fall

IMPORTANT:

north pole axis facing Sun: Summer

north pole axis facing away from Sun: Winter

Seasons NOT caused by change in Earth’s distance from the Sun

Earth farthest from Sun: summer (Northern Hemisphere)

Earth closest to Sun: winter (Northern Hemisphere)

Seasonshttp://macmillanmh.com/science/2008/student/na/scienceinmotion/Common/SIM.html?Module=../Grade4/Chapter8-EarthRevolvesAroundTheSun/

The SeasonsSolstice: shortest or longest day of the year

Northern Hemisphere (NYS)

Summer Solstice - June 21

N.P. axis faces towards Sun

More hours daylight

40°N-45°N: 15 hrs light

________________ opposite ________________

Southern Hemisphere

Winter Solstice – June 21

S.P. axis faces away Sun

Less hours daylight

40°S-45°S: 9 hrs light

The Seasons

Summer Solstice June 21

Winter SolsticeDec 21

Warm Warm

Cold

Cold

Towards SunAway Sun

The SeasonsEquinox: equal day & night (12 hours);

1st day spring/fallMarch 21, Sept 23 – 12 hour

day everywhere on earth

N.P. axis not facing

towards or away from Sun

At Equator:

12 hrs daylight

12 hrs darkness

year round;

Sun 90° directly overhead.

The Seasons

Summer Solstice June 21

Winter SolsticeDec 21

Warm Warm

Cold

Cold

Towards SunAway Sun

The SeasonsNorthern Hemisphere (NYS)

Winter Solstice – Dec 21

N.P. axis faces away from Sun

Less hours daylight

40°N-45°N: 9 hrs light_____________________ opposite ___________________

Southern Hemisphere

Summer Solstice – Dec 21 (yes, Christmas!!)

S.P. axis faces towards Sun

More hours daylight

40°S-45°S: 15 hrs light

The Seasons

Summer Solstice June 21

Winter SolsticeDec 21

Warm Warm

Cold

Cold

Towards SunAway Sun

The Seasons

• https://www.youtube.com/watch?v=F1nL_M1G1Xw

Wintersolstice

Summersolstice

23.5°N

23.5°S