Which of the following produced most of the oxygen that is found in the atmosphere today?
a living organisms
b outgassing
c condensation
d photodissociation
my gut is telling me b but i could be

What do lava flows made of aa indicate about the type of volcanic eruption that occurred? a. the eruption was viscous. b. the eruption was pyroclastic. c. the eruption was explosive. d. the eruption was quite. !

Identify the composition of oceanic and continental crystal rocks.in a model of earth’s interior,where would these rocks appear?

Apatient has an open displaced fracture of the second cervical vertebra. this is her fifth visit and the fracture is healing normally. what icd-10-cm code is reported?