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Unit 6: Change Over Time
Transcript of Unit 6: Change Over Time
Season 2010 Hurrican Season Anthrosphere Oil Spills Ice Caps Urban Sprawl Dams Atmosphere http://oceanmotion.org/ #1 Geologic Time
is longer than a
human lifespan #2 Our world is
very small and fragile Understand two things to begin
to think about change over time. Choral Reefs The Earth Has Many Spheres In each sphere you can see evidence of changes over time Volcanoes Pangaea Ozone Layer "All of human history occured on thise tiny blue dot" (Carl Sagan) Deforestation Major Earthquakes Wars Nuclear
Explosions Agriculture Sea Level Rise Cryosphere The rocky outer layer of the Earth's Surface Layer of gases around the Earth's Surface All the water on Earth's surface All the ice in the world All life on Earth What is the message of the film? How does the film show you different
perceptions of time? What does the wheel represent? What happened when the growth stopped? What do you think caused it? Ocean Temp. Changes Anthro means human and everything we make is part of that sphere. Over Long periods of time our solar system has many effects that change over time. The magnetic sphere around us that protects us from solar radiation Solar weather and radiation is always "blowing", sometimes there are storms. From this distant vantage point, the Earth might not seem of particular interest. But for us, it's different. Look again at that dot. That's here, that's home, that's us. On it everyone you love, everyone you know, everyone you ever heard of, every human being who ever was, lived out their lives. The aggregate of our joy and suffering, thousands of confident religions, ideologies, and economic doctrines, every hunter and forager, every hero and coward, every creator and destroyer of civilization, every king and peasant, every young couple in love, every mother and father, hopeful child, inventor and explorer, every teacher of morals, every corrupt politician, every "superstar," every "supreme leader," every saint and sinner in the history of our species lived there – on a mote of dust suspended in a sunbeam.
The Earth is a very small stage in a vast cosmic arena. Think of the rivers of blood spilled by all those generals and emperors so that, in glory and triumph, they could become the momentary masters of a fraction of a dot. Think of the endless cruelties visited by the inhabitants of one corner of this pixel on the scarcely distinguishable inhabitants of some other corner, how frequent their misunderstandings, how eager they are to kill one another, how fervent their hatreds.
Our posturings, our imagined self-importance, the delusion that we have some privileged position in the Universe, are challenged by this point of pale light. Our planet is a lonely speck in the great enveloping cosmic dark. In our obscurity, in all this vastness, there is no hint that help will come from elsewhere to save us from ourselves.
The Earth is the only world known so far to harbor life. There is nowhere else, at least in the near future, to which our species could migrate. Visit, yes. Settle, not yet. Like it or not, for the moment the Earth is where we make our stand.
It has been said that astronomy is a humbling and character-building experience. There is perhaps no better demonstration of the folly of human conceits than this distant image of our tiny world. To me, it underscores our responsibility to deal more kindly with one another, and to preserve and cherish the pale blue dot, the only home we've ever known. Is human activity causing changes in the Earth that can effect our planet’s ability to sustain life?