According to current science, why didn't oxygen begin to accumulate in the atmosphere for more than a billion years after life appeared on the Earth?
A) Early forms of animal life consumed the oxygen released by plants during the first billion years of life on Earth.
B) Early life did not release oxygen, and oxygen releasing organisms didn't evolve for a billion years after the earliest life.
C) Oxygen was removed from the atmosphere by dissolving in the ocean as quickly as it was released by life.
D) Oxygen was removed from the atmosphere by chemical reactions with surface rocks as quickly as it was released by life.
D
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A particle (charge = Q) is kept in a fixed position at point P, and a second particle (charge = q) is released from rest when it is a distance R from P. If Q = +2.0 mC, q = -1.5 mC, and R = 30 cm, what is the kinetic energy of the moving particle after it has moved a distance of 10 cm?
a. 60 kJ b. 45 kJ c. 75 kJ d. 90 kJ e. 230 kJ
On the surface of which moon of Saturn are liquids observed to exist?
A) Enceladus B) Mimas C) Iapetus D) Titan
Which of the following materials present in the solar system had the highest condensation temperatures?
A) metals B) rocks C) hydrogen and helium gases D) hydrogen compounds like water, methane, and ammonia
Enforce laws
What will be an ideal response?