{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Lecture 9 - Earth - Interior and Surface Activity

Lecture 9 - Earth - Interior and Surface Activity - Earth...

Info icon This preview shows pages 1–9. Sign up to view the full content.

View Full Document Right Arrow Icon
Earth: Interior and Surface Activity ASTRONOMY 3 Lesson 9 1 The relief globe in the Field Museum in Chicago represents Earth’s topography - see http:// en.wikipedia.org/wiki/Geology
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
NATURE of the Universe Review of Lesson 8 Astronomy - Earth: Interior and Surface Activity • Gravitational forces by the Sun and the Moon are responsible for the tides observed on Earth. Earth has two tidal bulges, one on the side facing the Moon and one on the opposite side. • Tidal forces from the Earth on the Moon have forced the Moon into tidal locking . The Moon is always facing the same side to Earth. The Moon’s rotation period is the same as its orbital period around Earth . • The Moon most likely formed in a collision of a Mars-sized proto-planet with the proto-Earth. This explains the low density of the Moon compared to the average density of the terrestrial planets. 2
Image of page 2
NATURE of the Universe Questions from Lesson 8 Astronomy - Earth: Interior and Surface Activity Think about (questions from Lesson 8): • Where does the heat in Earth’s core come from? • How do we know about the structure of Earth’s interior? 3
Image of page 3

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
• Earth’s Interior (Ch. 5.4) • Plate Tectonics (Ch 5.5) • Earthquakes (Ch 5.5) • Summary & Homework • Extra Credits & Review of Homework 2 NATURE of the Universe Today’s Topics Astronomy - Earth: Interior and Surface Activity 4
Image of page 4
Crust Mantle Core NATURE of the Universe Earth’s Interior Astronomy - Earth: Interior and Surface Activity Deepest drillings: 10 to 12 km (0.2% of Earth’s radius), i.e. they barely scratch Earth’s crust. How can we look deeper into Earth’s interior? Thickness of Earth’s crust in km 5
Image of page 5

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
NATURE of the Universe Earth’s Interior Astronomy - Earth: Interior and Surface Activity Earthquakes produce seismic waves, which travel through Earth and enable us to probe the interior. There are two kinds of seismic waves: P-waves travel faster than S-waves, and hence arrive earlier at the measurement station. 6
Image of page 6
NATURE of the Universe Earth’s Interior Astronomy - Earth: Interior and Surface Activity Two kinds of waves: P-waves (“primary” or “pressure”), which are like sounds waves. S-waves (“secondary” or “shear”) waves. Shear waves cannot travel through liquids. Seismic waves travel faster in denser material, i.e. we can use them to estimate the density of material in Earth’s interior. 7
Image of page 7

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
NATURE of the Universe Earth’s Interior Astronomy - Earth: Interior and Surface Activity (Washington) (New Hamphire) The Hawaiian 6.7 mag earthquake observed by various seismic stations across the USA.
Image of page 8
Image of page 9
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