Density In the solar system. Density on Earth Density of water 1.0 g/cm 3 Density of air 0.0012 g/cm...
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Transcript of Density In the solar system. Density on Earth Density of water 1.0 g/cm 3 Density of air 0.0012 g/cm...
Density on Earth
Density of water 1.0 g/cm3
Density of air 0.0012 g/cm3 (sea level at 15° C)
Changes in temperature, humidity and salinity can change the density of water and air
Density of Earth
Density is one of the clues geologists have used to help understand the internal structure of Earth
Inside Earth
Seismic waves from earthquakes passing through Earth provide important information about the size and characteristics of each layer.
15
10
5
Den
sity
g/c
m3
Inside Earth
Using these and other pieces of
evidence, geologists have
been able to create a model of Earth’s internal
structure.
Inside Earth
Seismic waves from earthquakes passing through Earth provide important information about the size and characteristics of each layer.
Inner Core
Outer Core
Mantle
The mass and volume of Earth are much larger than the mass and volume of the Moon.
Comparison of Earth and Moon
What about density?
Earth Average Density
5.5 g/cm3
Moon Average Density
3.4 g/cm3
What can we infer What can we infer about the about the
composition and composition and internal structure internal structure
of the Moon of the Moon based on its based on its
density compared density compared to Earth?to Earth?
Comparison of Earth and Moon
What about density?
Mercury vs. Ganymede
Average Density5.43 g/cm3
Average Density1.94 g/cm3
Credit: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington Credit: NASA
Mercury vs. Ganymede
Average Density5.43 g/cm3
Average Density1.94 g/cm3
Credit: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington Credit: NASA
What can we infer about the What can we infer about the compositions of Mercury and compositions of Mercury and
Ganymede based on their Ganymede based on their densities?densities?
Mercury vs. Ganymede
Rock surrounding a large iron core
Image courtesy of Windows to the Universe Credit: NASA
Icy shell surrounding a small rocky mantle and
small metallic core
1 CeresDiameter = 606 miles
4 VestaDiameter = 348 miles
The DAWN spacecraft will determine the mass of Vesta and Ceres by
measuring each asteroid’s gravity.
Vesta arrival: July, 2011Vesta departure: September, 2012Ceres arrival: February, 2015
http://dawn.jpl.nasa.gov/
Calculating average density using the mass will give us information about their internal structure