Show:
Rotation
Revolution
Seasons
Solstice/Equinox
Magnetosphere
100
Define Earth's rotation
spinning on its axis which is tilted 23.5
100
What is revolution?
motion of the Earth traveling around the sun
100
Why do seasons occur?
because the Earth is tilted 23.5 degrees on its axis. the amount of solar energy falling on different areas changes as we revolve around the sun
100
What happens during the equinox?
noon sun is directly over the equator
100
What is the magnetosphere?
invisible lines of force that form a magnetic field around the Earth
200
How long is 1 of earth's rotations?
1 rotation = 1 Earth Day 24 hours or 23 hrs 56 min
200
How long does 1 revolution take?
1 revolution = 1 earth year or 365.25 days
200
Why do we have summer or winter in the northern hemisphere?
Summer -the northern hemisphere is tilted toward the sun and receives direct sunlight and longer days Winter - northern hemisphere is tilted away from the sun and receives indirect sunlight and shorter days
200
What happens during the vernal equinox?
first day of spring usually March 21 sun over equator, day= night
200
What causes the magnetosphere?
Earth's rotation causes the swirling liquid iron in the outer core to become magnetized
300
What direction does the Earth rotate?
West to east; counter clockwise from above
300
What is aphelion?
when Earth is farthest from the sun in orbitl
300
Why do we get more sunlight?
When we are tilted towards the sun the Northern Hemisphere gets direct sunlight and has more light and less shadow.
300
What happens during the autumnal equinox?
first day of fall usually September 21 sun over equator, day= night
300
Why do magnetic north and south pole move around?
because the liquid outer core changes the way it swirls around
400
What is caused by rotation?
causes day and night
400
What is perihelion?
when the Earth is closest to the sun in orbit
400
Why do we get less sunlight?
When the Northern Hemisphere is tilted away from the sun we get less direct sunlight and more shadow and less ight
400
What happens during the summer solstice?
• first day of summer usually June 21 • noon sun directly over Tropic of Cancer; 23.5 degrees • longest daylight and shortest night
400
How does the magnetosphere protect us?
it protects us from the solar winds
500
What is the axis?
an imaginary line that runs from the North Pole throughthe Earth to the South Pole
500
What is the Earth's orbit and what is its shape?
the path the Earth follows as it goes around the sun; our orbit is ellipitical
500
What are the seasons in the Southern Hemisphere compared to the Northern Hemisphere?
When the northern hemisphere has summer is it winter in the southern hemisphere because they are tilted away from the sun and get indirect sunlight When the northern hemisphere has winter it is summer in the southern hemisphere because they are tilted towards the sun and get more direct sunlight
500
What happens during the winter solstice?
•first day of winter usually December 21 •noon sun directly over Tropic of Capricorn; 23.5 degrees •shortest day and longest night
500
What is the shape of the magnetosphere and why?
the magnetosphere is compressed on one side and spread out on the other due to the solar winds