Flashcards in Ch. 1 - Introduction Deck (9)
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1
13.8 By
approx age of the universe
13.8 x 109yr
2
approx age of Earth
4.5 x 109yr
3
the beauty part about ♁ distance from ☉ is:
water exists naturally in all 3 phases
4
the "spheres" of Earth
atmosphere, hydrosphere, biosphere, geosphere
5
atmosphere - mass relative to Ô, composition today
< 0.01% MÔ; 78% N2, 21% O2, < 1% other gases
6
water is present as (phase, %):
oceans ~97.2%; ice ~2.15%; groundwater ~0.62%;
soil moisture, vapor in atmosphere, inland lakes, rivers < 1%
7
what is the main sculptor of land masses on Ô
running water; wind is a negligible factor
8
what is the 5th sphere?
the anthroposphere (not yet formalized)
9
