Presentation on theme: "Weather 13.1 & 13.3 A Closer Look at the Earth and Why we have Seasons"— Presentation transcript:
1 Weather 13.1 & 13.3 A Closer Look at the Earth and Why we have Seasons BLM 13.1AQuick Review Question Sheet
2 Weather and Climate (Q3) Weather… What is It?Day to day environmental conditionsExamples:Rainy / snowycloudy / sunnyWindy / calmClimateEnvironmental condition averaged over many yearsAverage rainfallAverage daily temperature
3 Weather and Climate Variable used to describe weather and climate: TemperatureWind Speed and DirectionVisibilityCloud coverAtmospheric PressureDew PointHumidity
4 Formation of Weather and Climate Now some questions for you to think about… I’ll read the question to you and then ask you what the first thing is you think about…Now that you know what weather is can you tell me if the weather is the same here as it is in St. John? Why not?Geographically, how is St.John different than Fredericton?Would any of these geographical features affect the weather in that area? If so which ones and how?Good Discussion!Here are the facts:Components that influence weather and climate include:Latitude and LongitudeAtmosphereOceansLand Masses
5 Influences on Weather and Climate and Latitude/Longitude (Q1) Components that influence weather and climate include:Latitude and LongitudeAtmosphere (later)Oceans(later)Land Masses(later)This Video (10 min) will get you started on Lat. And Long.!!More information to come :>Lat & Long
6 Longitude (Meridians) (Q4) Angle of measure east or west of the Prime MeridianImaginary vertical linesLabel on Your MapPrime Meridian 0o (Greenwich, England)International Dateline 180o
7 Latitude (Parallels) (Q5,6,7) Angle of measure north or south of the EquatorImaginary horizontal linesLabel on Your Map:(BLM 13.1A)Equator 0oNorth Pole 90oNSouth Pole 90oSArctic Circle 67.5oNAntarctic Circle 67.5oSTropic of Cancer 23.5oNTropic of Capricorn 23.5oS
8 Earth’s Rotation and Revolution Rotation (24 hours)The Earth rotates on its axisThe axis (imaginary line) runs North to South23.5o angleOne Earth rotation takes one dayRotate East to WestRevolution (365 Days)The Earth revolves around the SunThe movement of one object traveling around anotherIt takes the earth one year to revolve (travel) around the Sun counter clockwiseAny ideas as to how earth’s tilt towards or away from the sun can effect the 4 season’s we experience here in Canada??
9 Reason for the SeasonsThe average tilt, 23.5o, of the Earth is the reason for the seasons)As the Earth revolves around the Sun, the seasons in the northern and southern hemispheres are opposite.
10 Earth North Pole Equator South Pole Earth’s Seasons Tilt of the Earth’s axis towards or away from the sun creates the seasonsWhen the north pole tilts toward the sun, it gets more radiation – more warmthduring the summerSUMMER (Northern Hemisphere)North PoleEquatorEarthWhen the north pole tilts toward the sun, the south pole tilts awaySo when it’s summer in the north,it’s winter in the southSouth PoleWINTER (Southern Hemisphere)
11 Earth North Pole Equator South Pole Earth’s Seasons Tilt of the Earth’s axis towards or away from the sun creates the seasonsWINTER (Northern Hemisphere)When the north pole tilts awayfrom the sun, it gets less radiation –So it’s colder during the winterNorth PoleEquatorEarthSouth PoleWhen the north pole tilts away from the sun, the south pole tilts toward it…When it’s winter in the north,it’s summer in the southSUMMER (Southern Hemisphere)
12 Bill Nye: Seasons Handout: Seasons Worksheet (24 min)
13 Reason for the Season Video: Answer Key 1. What does the term axis mean?A. Axis is an imaginary line that runs through the North and South poles of the Earth. The earth spins on it at a 23.5o angle.2. What is the angle of tilt for the earth’s axis?A. 23.5o3. How long does it take the earth to spin or rotate on its axis?A. 24 hours4. How long does it take the earth to orbit or revolve around the sun once?A. 365 ¼ days5. What are those seasons?A. Autumn, spring, winter, summer
14 Reason for the Season: Answer Key 6. Why is the angle of rays of sunlight so important in determining the amount of energy collected by the earth?A. Slanted rays spread out over a larger area therefore the heat and energy is also spread out.7. What does the term migration mean?A. Animals moving from one point of the country or world to another during certain seasons.8. Plants are the only organisms capable of making their own food. That food making process is called:A. Photosynthesis9. Plants produce more than food. One gas that plants release into the air is used by animals. It is called:A. Oxygen10. What is the average distance of the earth from the Sun?A. 93 million miles
15 Reason for the Season: The Earth’s Tilt 1. Why is the tilt of the earth the cause for the seasons?A. Seasons are not connected to Earth's distance from the Sun - our northern winter takes place when the Earth is actually closest to the Sun - but due to the fact that the Earth's axis is tilted away perpendicular to the ecliptic, winter takes place.The greater the angle, the less energy transferred.
16 Reason for the Season: The Earth’s Tilt Q2. The North pole and South Pole each have long periods of complete sunlight and complete darkness. Why?A. When the Earth is tilted away from the Sun, the North Pole has no Sun for about 6 months. During the same time, the South Pole is pointed toward the Sun and receives nothing but Sun.NEXT… What is wind? And how is it formed…
17 Mapping Activity Short Worksheet – Part A: students to determine latitude and longitude of a locationPart B: students to determine location based on latitude and longitude.