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CSU NR 150 - Origin of the Onceans

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NR150 1st EditionLecture 3Outline of Last LectureI. Info on Marine Resources II. Physical Marine Resources III. Energetic Marine Resources IV. Biological Marine Resources V. Non-Extractive Marine ResourcesOutline of Current Lecture I. What is Science and How Does it Work?II. The Big Bang Theory III. Stars IV. GalaxiesV. Our Solar SystemVI. How the Moon Formed VII. How Water Vapor and Oceans Formed Current LectureI. What is Science and How Does it Work 1. The systematic process of asking questions about the observable world 2. Step One: Systematic process of asking questions 3. Step Two: Forming a working hypothesis 4. Hypothesis: Speculation about the observable world that can be tested 5. Step Three: when a hypothesis is consistently supported by observations or experiments then it is advanced to the status of theory6. Theories may change as our knowledge and our powers of observation change II. The Big Bang Theory 1. all matter was condensed in on tiny place2. then there was a big bang and the matter started expanding 3. Edwin Hubblea. changed our understanding of the universe b. confirmed the existence of other galaxies c. showed that the universe is expandingd. Made a theory called Hubble’s Law of Expansion which stated that red shifts are going away from you and blue shifts are coming toward you e. with this he proved the universe is expanding 4. Formation of Mattera. the universe continued to expand and as it expanded its temperature cooledThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.b. the energy of each particle started to decrease III. Stars1. Stars begin as protostars 2. spend 90% of their life time fusing hydrogen into helium3. this fusion generates the light we see 4. once hydrogen energy is used up, the core contracts and forms heavier elements5. in its final stage iron formsIV. Galaxies 1. huge rotating aggregation of stars, dust, and gas2. the galaxy we live in is the milky way V. Our Galaxy 1. objects composing our solar system condensed about 5 billion years ago from a thin cloud that had been enriched by heavy elements made in exploding stars 2. Accretion: the clumping of small masses into larger masses3. period of accretion latest about 30-50 million years4. the protosun became the sun 5. Earth’s Magnetic Shield a. protects earth from incoming solar radiation, solar storms, etc.b. pressure began to melt the inside of earthc. core is the densest part of earth and is made of irond. because we are rotating and the core is iron the magnetic shield is formede. suns solar storms would just blow away our atmosphere without the shield f. the iron core of earth created a magnetic field that shields us from solar storms which is why we have an atmosphereg. solar flares go around earthh. solar flares the go through the shield at the poles are responsible for the northern lights i. when sun spots gets a certain size it gets a number j. the more sun spots there are the more active it is VI. How the Moon Formed 1. a planetary body somewhat larger than mars smashed into earth and knocked earth of its axis 2. tilted axis is what gives un different seasons3. if it were straight we would always get the same amount of rays and have no seasons4. finding water on the moon makes us think it had a little bit of plate tectonics 5. the primary physical property that sorts the earth, ocean, and atmosphere is density stratification These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.6. heaviest part of earth is the core7. young earth was hot and molten VII. How Water Vapor and Oceans Formed 1. Water Vapor a. sun stripped away earth’s first atmosphereb. gasses, including water vapor, released by the process outgassing replaced the atmospherec. greenhouse gasses are necessary for the atmosphered. water vapor condensed into cloude. water droplets formf. were probably very hot and evaporated againg. boiled back into the cloudh. oceans were probably much hotter than they are todayi. Icy comets may have slammed into earth and melted to give us the water we have 2. Oceans a. outgassingb. icy cometsc. probably a combination of bothd. icy comets probably got water to the moone. Intense bombardment of the early earth by large bodies probably lasted until about 3.8 billion years ago These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a


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CSU NR 150 - Origin of the Onceans

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