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Science Test study

What are the substance in earth's second atmosphere? Water vapor, nitrogen and carbon dioxide
What are the substances in the first atmosphere? Helium and hydrogen
What substance do living organisms give to the atmoshpere? Oxegyn
What are the earliest life forms similar to? Bacteria
What is a comet? A ball of dust and ice that orbits the sun
What galaxy is earth in? The Milky Way
What is the closest galaxy to the Milky Way? The Andromeda Galaxy
What is the closest star to earth besides the sun? Proxima Centuri which is 4.2 light years away
What is the distance a star travels in a year? Light years
When did Precambrian begin? 4.6 billion years ago
When did accretion start? 4.6 billion years ago
Order of earth's formation: 1. Beginning of accretion-4.6 billion BP, 2. End of accretion- 4.5 billion BP, 3. Precambrian-544 million BP, and 4. Modern time
When did Cambrian start? 544 million years BP
Created by: LaxyLucy7