Life Cycles of Stars
What is another name for a cloud of mainly hydrogen that forms stars?
Star-Forming Nebula or Stellar Nebula
Where are trenches located, what type of boundary?
Convergent Boundary
What range of years was the Mississippian period? Also during the carboniferous period?
323-359 mya
The probable fate of our sun is to
Expand as a red giant, shed its outer layers, and end as a white dwarf.
Which layer has the most density? Why?
Inner Core. Because it has the most density and pressure.
What period was it also called?
Carboniferous period
Massive stars have shorter or longer lifespans? Explain.
They have shorter lifespans because of massive fuel consumption.
What boundary has ridges? What does it show (page 11)
Divergent boundary - see floor spreading
What organisms (life on earth) was on earth then?
Large and numerous vascular plants and earliest reptiles.
Massive stars produce Iron (Fe) in the core. This is a star-killer. The outward force of nuclear fusion can no longer balance out the force of gravity pulling in. The star collapses and it takes a 1/4 of a second.
What is the depth of the upper mantle?
1070 km
What eons happened when stromatolites were around?
Archeon Eon, and Proterozoic Eon
Describe the pathway that a sun-like star will take. Begin with Nebula. (Beginning at early state is the main sequence stage)
Nebula - Protostar - Main Sequence - Red Giant - Planetary Nebula - either White Dwarf or Nebula
Why is the outer core liquid, even though it's made out of iron and nickel?
It has less pressure and density than the inner core.
What life on earth was happening during the Jurassic period?
Earliest birds, peak of sauropods and ammunoids, abundant dinosaurs and ammonoids, oldest sauropods