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Mapping the Globe and The Earth in Space
Transcript of Mapping the Globe and The Earth in Space
Most of the Earth’s energy comes from the sun (SOLAR ENERGY)
EARTH’S ROTATION, REVOLUTION, AND TILT
Our four seasons are caused by the Earth and Sun’s relationship
Solstices occur when the sun is directly over one of the Tropics
These occur on June 21 and December 21
Equinoxes occur as the sun is directly over the Equator
ATMOSPHERE—The gasses that surround the Earth
The rest is mainly Carbon Dioxide and Ozone
EARTH’S FOUR SPHERES
Earth is 93 million miles away from the sun
100 times bigger than Earth.
The sun is an average sized star, but still is more than
Most planets have moons orbiting them
The Earth has 1 moon, while Jupiter and Saturn have 60+.
Our solar system has 8 planets, with others being discussed.
The inner four planets are made of solid material
The outer four are made mostly of gasses.
Across the universe, there are groups of stars called Galaxy’s
Any star with planets orbiting around it has a solar system
Our sun is in the Milky Way Galaxy
Most astronomers think the universe is 10-20 Billion years old.
The Earth is not sitting in space straight up and down
The Earth has a 23 and ½ degree tilt, its axis always pointing
towards the North Star
It takes 365 and ¼ days for the earth to REVOLVE around the sun.
It takes the Moon 29 and ½ days to REVOLVE around the Earth.
The Earth ROTATES on its axis 1 time every 24 hours in a west to east direction
This rotation causes night and day
When the Earth tilts so that the sun is over the Tropic of Capricorn, it is summer in the Southern Hemisphere
When the Sun is over the Equator, it is Fall and Spring
When the Earth tilts so that the sun is over the Tropic of Cancer, it is summer in the Northern Hemisphere
Basically, the sun’s direct rays shift throughout the year from the Tropic of Cancer to the Tropic of Capricorn
This also causes 24 hours of daylight or night time within the Arctic and
It is the longest day of the year in the N.H. and shortest in the S.H.
The December solstice is the opposite
The June solstice marks the first day of summer in the
Northern Hemisphere and first day of winter in the Southern Hemisphere
These mark the beginning of Spring and Fall
These occur on March 21 and September 22
Biosphere-Any part of the Earth containing life forms
EARTH’S 4 SPHERES MAKE UP THE ENVIRONMENT
Hydrosphere-The water on Earth
70% of the Earth’s surface is covered in water
Lithosphere—The solid crust on the surface of the Earth
The nearest star other than that is 4.2 light years away