Geo. Exam - Exam#1 Scientific Explanations are tentative...

Info icon This preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Exam #1 Scientific Explanations are tentative, based on empirical obs., predictable and testable, and provide well defined natural cause to explain occ. Of natual event. Stars and Planets : stars use hydrogen as fuel. High temps. Stars fuse hydrogen atoms together= nuclear fusion and forms helium. When hydrogen is used up stars burn out. Violently=supernovas , Less violent=Sun, ends at carbon. When stars form, surrounded by disc of cosmic debris. Gravity pulls debris together=Planets. Heavy planets=close to star. Light planets=far from star. Stars and Planets form at SAME time. Big Bang=formation of universe, not solar system. Big Bang created hydrogen and helium. Hydrogen= 1 proton + 1 electron. Helium=2 protons+2 neutrons+2 electrons. 75% of universe is hydrogen/ 25% helium. Stars vary in size and age. Solar System : 8 planets, 4 Terrestrial =crust, mantle, core in layers=Mercury, Venus, Earth, Mars. 4 Jovial =large gas, with many moons and rings=Jupiter, Saturn, Neptune, Uranus. Earth, Sun and Seasons : season temp. changes due to tilt in earths axis and angle from sun rays. Tilt=23.5 degrees. Tropic of cancer and Capricorn are 23.5 N. and S. of equator.
Image of page 1
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern