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Earth (Water covers 72% of surface (origin (theories) (scavenged directly…

- - - - water added through cometary impact
        
        Halley and Hyakutake examined
        
        hydrogen isotopes don't match (Earth/comet samples)
        
        unlikely origin :red_cross:
        
        \(^{1}\text{H and } ^2\text {H}\)
    - - 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:
    - - 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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Earth

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)

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 ❌

water bearing grains

became incorporated into planetesimals

formed around 1 AU or further out ❓

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 #

unlikely origin ❌

\(^{1}\text{H and } ^2\text {H}\)