Unit 2 Review Crossword (Part 1)

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Across
  1. 3. the development of this was important for the development of life on land
  2. 8. a type of plate boundary formed when plates reverse direction
  3. 9. the concept responsible for Earth's formation of layers
  4. 10. Earth's early atmosphere is thought to be similar to gases produced by these
  5. 13. this layer of the Earth creates a magnetic field, which protects the Earth from the Sun's harmful radiation and charged particles
  6. 15. this number tells us how many protons and neutrons are in the nucleus of an atom
  7. 16. how much time it takes a radioactive isotope to decay by one half
  8. 17. heat from the core of the Earth tranfers to the mantle, where this process takes plates that drives plate tectonics
Down
  1. 1. fossil evidence of early life on Earth that produced oxygen and changed Earth's atmosphere
  2. 2. the gas thought to be the most prevalent in Earth's early atmosphere
  3. 4. Earth's early oceans were formed from the outgassing of volcanoes as well as the bombardment of Earth by these
  4. 5. the Early Earth "grew" due to this process
  5. 6. the second most abundant gas in Earth's atmosphere
  6. 7. the presence of banded iron formations in the rocks from this era suggests that there was some oxygen present in the atmosphere
  7. 11. the first ocean water formed from this process that is part of the water cycle
  8. 12. along with hydrogen, formed Earth's earliest atmosphere
  9. 14. a type of seismic wave that can only pass through solids