Answer:
Away from the ridge, where the sea floor is older and has more time to accumulate; also much thickest near continents
Explanation:
4.6 billion years ago - most likely hydrogen (H2) and helium (He)
probably rich in hydrogen compounds like methane (CH4), ammonia (NH3), hydrogen cyanide (HCN), water (H2O), and formaldehyde (HCHO). Also some N2, CO2 but LITTLE or NO free oxygen.
Molecules of H2 and He move really fast, especially when warm, that they eventually all escaped Earth's gravity and drifted off into space.
Answer:
The most highly developed geocentric model was that of Ptolemy of Alexandria (2nd century).
The level below which the ground is saturated with water.
