eas 1.4 - Earth Subsystem

1. Earth - Third Planet from the Sun
2. Earth - is the largest of the terrestrial planets
3. Earth - It is the only known planet to support life
4. Atmosphere, Climate, Water, Light, Sun - Why Earth is the best planet in the Solar System that can support life?
5. Atmosphere - Oxygen is constantly put by plants and trees.
6. Atmosphere - Is thick enough to prevent poisonous rays of radiation from getting through it.
7. Climate - There is a moderate amount of carbon dioxide in the planet's atmosphere.
8. Climate - The temperature on Earth does not go from one extreme to the other either
9. Water - Other liquids contain poisonous elements.
   10. Water - can be found anywhere, in its three states (solid, liquid and gas)
   11. Light - Plants need sunlight in order to grow
   12. Light - Earth spins on its axis in a span of 24 hours
   13. Sun - To allow life to be created and to support it, earth receives the perfect amount of heat and light.
   14. Sun - gravity keeps earth in its orbit.
   15. Geosphere - It is consist of three major layers: core, mantle, and crust.
   16. Outer Core - 1400 miles thick and combination of iron, alloy, and nickel.
   17. Inner Core - about 750 miles thick and made up primarily of iron.
   18. Mantle - accounts the big volume of the earth
   19. Mantle - covers the core and lies beneath the crust
   20. Outermost Mantle - is cool, strong, and hard
   21. Innermost mantle - is hot, rock is not stable, soft, plastic, and flows slowly.
   22. Crust - outermost layer
   23. Crust - a thin veneer below a layer is soil and beneath the ocean water.
   24. Crust - composed almost entirely of solid rock
   25. Hydrosphere - It is the liquid water component of the earth which circulates among oceans, continents, glaciers, and the atmosphere.
   26. Ocean - makes up 71% of Earth
   27. Glaciers - cover about 10% of Earth’s land surface today.
   28. Atmosphere - mixture of nitrogen (78%), oxygen (21%), and other gases (1%) that surrounds Earth.
   29. Atmosphere - It supports life by regulating climate by acting as a blanket and filter, retaining heat at night and shielding us from direct solar radiation during the day.
   30. Troposphere - 10 km. from the earth’s surface
   31. Troposphere - Formation of weather
   32. Jet stream - are fast flowing, narrow, meandering air currents
   33. Tropopause - border between tropopause and stratosphere
   34. Stratosphere - 30km – 50 km from Earth’s surface
   35. Stratosphere - Ozone layer
   36. Mesosphere - The “middle layer”
   37. Mesosphere - 50km – 90 km above Earth’s surface
   38. Mesosphere - Coldest region of the atmosphere
   39. Mesosphere - The layer where most meteors burn up upon atmospheric entrance
   40. Mesopause - border between mesosphere and thermosphere
   41. Thermosphere - Sun’s radiation strips off
   42. Thermosphere - “Ionosphere”
   43. Thermosphere - 90km – 400km above the Earth’s surface
   44. Thermosphere - Occasionally seen is the aurora borealis and aurora australis
   45. Thermosphere - Many satellites actually orbit the Earth within thermosphere
   46. Exosphere - Topmost part of the atmosphere
   47. Exosphere - Composes of hydrogen and helium
   48. Exosphere - Thinnest region of the atmosphere
   49. Exosphere - 400km – 500km above Earth’s surface
   50. bios - life in greek
   51. sphaira - sphere in greek
   52. Biosphere - all about life. All of the microbes, plants, and animals can be found
   53. Biosphere - extends to the upper areas of the atmosphere where birds and insects can be found. It also reaches to dark caves deep in the ground or to the bottom of the ocean at hydrothermal vents.

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