How do caves and caverns form in limestone?
What will be an ideal response?
Answer: Rainwater falling through the air becomes slightly acidic from chemical reactions with natural carbon dioxide in the air. When this slightly acidic rainwater comes in contact with limestone, the acidic water partially dissolves the rock. For caves and caverns to form, time is needed.
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Microscopic slush in water tends to make the water
A) more dense. B) less dense. C) slipperier. D) warmer.
Placing the Hubble Space Telescope in space gives better resolution because it is
A) above the atmosphere which distorts images. B) in circular orbit where there is no spherical aberration. C) in elliptical orbit where there is no spherical aberration. D) larger than the largest ground-based telescopes. E) free from gravity-produced optical flaws.
The fact that a particle cannot be precisely localized is the
a. photoelectric effect. b. uncertainty principle. c. principle of a hologram. d. principle of a laser. e. reason why photons are emitted.
As with stars, binary galaxy pairs are useful in finding their total mass
Indicate whether the statement is true or false