The first atmosphere was mostly water vapor, but by 3.8 million years ago the atmosphere had changed to mainly CO2 (carbon dioxide) and methane. What happened to the water vapor?
A. Chemical reactions from the heat and solar radiation changed it into the CO2 and hydrogen gas.
B. The early earth's gravitational field wasn't strong enough to trap it, and it escaped into space.
C. Condensation over time converted it to rain and then eventually oceans.
D. The water vapor bound with silicon, sodium, and other light metals forming sediment that settled on the surface and fused into the earth's crust.
Answers: 2
Biology, 21.06.2019 15:30, acediego3119
Skulls of (1) modern gorilla, (2) australopithecus afarensis, (3) homo erectus, (4) homo neanderthalensis, (5) homo sapiens based on the diagram, which of the following best describes ways in which the physical appearance of h. neandertalensis and h. sapiens differ? (2 points)
Answers: 1
Biology, 21.06.2019 15:40, mktdonaldson
Aneuron is stimulated with an electric pulse. the action potential is detected at a point 3.70 cm down the axon 0.0052 s later. when the action potential is detected 7.20 cm from the point of stimulation, the time required is 0.0063 s. what is the speed of the electric pulse along the axon? (why are two measurements needed instead of only one? )
Answers: 2
Biology, 22.06.2019 13:00, archiecom55
Sequence how oxygen accumulated in the atmosphere and the effect it had on life by completing the flowchart
Answers: 1
The first atmosphere was mostly water vapor, but by 3.8 million years ago the atmosphere had changed...
Geography, 28.01.2021 03:40
Mathematics, 28.01.2021 03:40
Mathematics, 28.01.2021 03:40
Mathematics, 28.01.2021 03:40
English, 28.01.2021 03:40
Social Studies, 28.01.2021 03:40