the Hadean Flashcards
how was the moon formed
4.53 Ga years ago a large planetoid collided with earth
then the debris from the collision makes a ring around the earth for the moon to rotate in
what evidence exists that proves that the earth was hit by a large planetoid and made the moon
the moon has the same composition similar to the earth mantle
how long ago was crust was somewhat present on the earth
4.5 Ga years ago
what does the presence of Zircon tell us
earth was warm enough to have liquid water
Because sedimentary rocks in Australia have Zircon, and those rock have a age of 4.4 Ga
what is the oldest rock on earth
Acasta Gneiss
how old is the Acasta Gneiss rock
approx. 4 Ga years old but is older but unknow how much older
how did the atmosphere develop
from volcanic gases
how did the hydrosphere develop
after the volcanoes would erupt and gases and earth becomes cool enough moisture condenses and accumulates
what kinds of things do volcanoes emit
water vapor, CO2, hydrogen, nitrogen, ammonia, methane
what are the two ways that water got to earth
outgassing from earth interior
bombardment by meteorites and icy comets
