One of Edwin Hubble's discoveries is that the known universe is expanding. This means that
A. light rays bend as they near the event horizon of a black hole.
B. most all observable galaxies are moving away from each other.
C. the mass of the universe is slowly dissipating.
D. light rays undergo acceleration as they travel vast distances.
Answer: B
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Although coal is an abundant fuel, when burned it produces very high _____________________ emissions.
Fill in the blank(s) with the appropriate word(s).
"What does mantle convection look like?"
What will be an ideal response?
________ of seawater is a strategy being adopted to augment diminishing groundwater supplies
A) Desalination B) Reclaiming C) Recycling D) Condensation E) Evaporation
An artesian aquifer occurs where ________
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