The nitrogen in Earth's atmosphere primarily came from
a. ammonia delivered by comet impacts.
b. photosynthesis done by algae and plants.
c. oxidation of silicate-rich minerals.
d. rock delivered by asteroid impacts.
e. its primary atmosphere.
a. ammonia delivered by comet impacts.
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The seasons result from the tip of the Earth's equator and axis relative to its orbit
Indicate whether the statement is true or false
Suppose a Young's experiment is carried out in air, and then, in a second experiment, the apparatus is immersed in water. In what way does the distance between bright fringes change?
1.They move further apart. 2.They move closer together. 3.There is no change.
Which of the following statements cannot be tested by science today?
A) Prior to the Planck time, our universe sprouted from another universe. B) Our universe is flat. C) The universe is 14 billion years old. D) The expansion of the universe is now accelerating.
The break-up of Pangaea had worldwide consequences with the exception of
A) the lowering of sea level. B) a rise in sea level. C) the divergence and evolution of new species. D) climate change.