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Density

Density. In the solar system. Density on Earth. Density of air 0.0012 g/cm 3 (sea level at 15° C). Density of water 1.0 g/cm 3. Changes in temperature, humidity and salinity can change the density of water and air. Density on Earth. Igneous rocks. Density of rocks 2.2-3.3 g/cm 3.

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Density

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  1. Density In the solar system

  2. Density on Earth Density of air 0.0012 g/cm3 (sea level at 15° C) Density of water 1.0 g/cm3 Changes in temperature, humidity and salinity can change the density of water and air

  3. Density on Earth Igneous rocks Density of rocks 2.2-3.3 g/cm3 Sedimentary rocks Metamorphic rocks

  4. Density of Earth Average Density 5.5 g/cm3

  5. Density of Earth Given the density of materials near Earth’s surface and the average density of Earth, what can we infer about the composition of Earth’s interior?

  6. Inside Earth Geologists infer that Earth has layers with different densities due to the way seismic waves from earthquakes bend as they pass through Earth’s interior.

  7. Inside Earth Using these and other pieces of evidence, geologists have been able to create a model of Earth’s internal structure. 15 10 5 Density g/cm3

  8. Inside Earth Inner Core Outer Core Mantle Seismic waves from earthquakes passing through Earth provide important information about the size and characteristics of each layer.

  9. Comparison of Earth and Moon The mass and volume of Earth are much larger than the mass and volume of the Moon. What about density?

  10. Comparison of Earth and Moon What can we infer about the composition and internal structure of the Moon based on its density compared to Earth? Moon Average Density 3.4 g/cm3 What about density? Earth Average Density 5.5 g/cm3

  11. Mercury vs. Ganymede Average Density 5.43 g/cm3 Average Density 1.94 g/cm3 Credit: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington Credit: NASA

  12. Mercury vs. Ganymede What can we infer about the compositions of Mercury and Ganymede based on their densities? Average Density 5.43 g/cm3 Average Density 1.94 g/cm3 Credit: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington Credit: NASA

  13. Mercury vs. Ganymede Rock surrounding a large iron core Icy shell surrounding a small rocky mantle and small metallic core Image courtesy of Windows to the Universe Credit: NASA

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