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Science

TermDefinition
How long ago was earth formed? 4.6 billion years ago
When did accretion begin? 4.6 billion years ago
When did accretion end? 100,000,000 years ago
what was in the first atmosphere but not the second? Helium
When was the beginning of the cambrian period? 540,000,000 BP
What type of substances were in the first atmosphere? Helium and Hydrogen
What substances were in the second atmosphere? Nitrogen, water vapor, and carbon dioxide
When was the beginning of the precambrian time period? 4.6 billion years ago
what is the closest star to us besides the sun? Proxima-Centuri
what is earth's galaxy? The Milky Way
What is the closest galaxy to us? Andromeda
What earliest life form is similar to the present day life forms? Bacteria
What is a comet? A commet is a ball of dust and ice that orbits the sun
What caused earth to form? Gravity
what was Introduced to the atmosphere by living organisms? oxygen
what Changed state and settled in the basins of the crust to become the oceans? water vapor
How long did accretion last? 100,000,000 years
What is a light year? How far light travels in a year
How many planets are in the solar system? 8 Planets
Created by: RobertsI22
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