Population
What is a planet made of?. One way in which scientists look at what a planet is made of is by looking at density.
NOTES: Earth: Age--4.6 billion years by radioactive isotope dating. Atmosphere--80% Nitrogen, 20% Oxygen, trace of Carbon Dioxide. Pressure = 14.7 lbs/sq.
Earthquakes
bbc.co.uk/news/world-asia-pacific-12729485
The official death toll to about 2,800 but the Miyagi police chief has said that more than 10,000 people are estimated to have died in his province alone.
Earthquakes And Earth’s Structure. Earth’s Structure.
Density and Planetary Differentiation. Planetary Differentiation is the separating of a planet into different layers due to differences in density. Seismic.
Starter: Compare the life cycle of a star with that of a human. 2/22-25/2013 145 146 2/22-25/2013 Exit: If there are more low-mass stars than high-mass.
Planet Mars
Why would you want to visit?
