Chapter 1 & 2.pdf - Chapter 1 So Where\u2019d it all come from The Home World The Earth and this entire star system formed approximately 4.5 billion

Chapter 1 & 2.pdf - Chapter 1 So Where’d it all come...

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Chapter 1So . . . Where’d it all come from?
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The Home WorldThe Earth, and this entire star system, formed approximately 4.5 billion years ago.The earth, and everything else in the solar system, condensed out of a Nebula left behind by an exploding star. (Supernova)(This is not to be confused with the Big Bang. Which happened about 14 billion years ago.) This, is a Nebula.
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M16 the Eagle Nebula
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It’s in layersAs the earth condensed it formed into layers of different densities.Your textbook refers to these layers as the different “Spheres” of the earth.See page 19
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The Geosphereand the BiosphereThe Geosphere is the solid earth. The Biosphere is allof the life on the earth.All of the Earth’s “spheres” areinterconnected and they all affecteach other.
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The Atmosphere and the Hydrosphere
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The CryosphereAll of the Earth’s “spheres” areinterconnected and they all affect each other.Earth System ScienceMelting Antarctic Ice Caps
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It’s often called the “Goldilocks Effect” Because everything has to be “ . . . Just right.”Earth is the only planet in this solar system where water can exist as a solid, and as a liquid and as a gas, all at the same time.It really is a pretty neat trick.
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The scientific methodGalileo is credited for inventing the Scientific Method that we use today.QuestionHypothesis a tentative, unproven explanation.
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  • Fall '11
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