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Earth (Water covers 72% of surface (origin (theories) (scavenged directly…
Earth
Water covers 72% of surface
origin (theories)
dry accretion
water added through cometary impact
Halley and Hyakutake examined
hydrogen isotopes don't match (Earth/comet samples)
unlikely origin :red_cross:
\(^{1}\text{H and } ^2\text {H}\)
scavenged directly from Solar nebula
along with other volatiles
\(\text{N_2, CO_2}\)
Solar nebula high in rare noble gases
not in Earth's atmosphere
unlikely origin :red_cross:
water bearing grains
became incorporated into planetesimals
formed around 1 AU or further out :question:
hydrated minerals
condense at higher temps than water does into ice
volatiles incorporated into Earth during formation
heat generation
accretion
core formation
moon formation
drove off volatiles
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