Where did the molecular oxygen in Earth's atmosphere come from?
A) photosynthesis by living organisms
B) the breakdown of water molecules by sunlight
C) outgassing from volcanoes
D) evaporation from the oceans
E) chemical reactions with surface rocks
B) the breakdown of water molecules by sunlight
You might also like to view...
Describe how we know that the expansion rate of the Universe is currently accelerating
What will be an ideal response?
In a double slit experiment, the intensity of the light reaching the center of he screen from one slit alone is I0 and intensity of the light reaching the center from the other slit alone is 9I0. When both slits are open, what is the intensity of the light at the minima nearest the center?
A. 4/0 B. 0 C. 8/0 D. 2/0
The first planets ever discovered outside our Solar System were
A: Making their host stars wobble around detectably in the sky B: Transiting their host stars once every day C: Brightening background stars via microlensing D: In orbit around a millisecond pulsar, not a normal star E: Making their host stars wobble around such that the velocity could be detected by the Doppler Effect
Why won't a transformer work (stepup or stepdown potential) if a battery is connected across the input?
What will be an ideal response?