Which of the following statements explains why stars are not visible during the day?
A. The light from the sun is too bright
B. The light from the stars is absorbed and scattered by the atmosphere and does not reach the ground.
C. The brightness of scattered light from the sky prevents the visibility of weaker light from the stars.
D. The Earth is pointed away from the centre of the galaxy.
Answer: C
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Which principle best describes why melting occurs first in snow around tree trunks?
a. Snow is a good absorber of infrared energy. b. Snow is a poor emitter of infrared energy. c. Snow is a poor reflector of visible light. d. Snow is a poor absorber of visible light. e. Snow is a poor absorber of ultraviolet light.
When oceanic plates meet continental plates at a convergent boundary, a ____.?
a. subduction zone will form because the oceanic plate is more dense than the continental plate b. subduction zone will form because the oceanic plate is less dense than the continental plate c. rift zone will form because the oceanic plate is more dense than the continental plate d. rift zone will form because the oceanic plate is less dense than the continental plate e. ?subduction zone will form on the oceanic plate, and a rift zone will form on the continental plate
Which of the following does not describe an element of an ecological niche?
A. the place where the species lives B. how much water the species needs C. how much sunlight the species needs D. how much space the species needs E. temperatures the species can tolerate
At room temperature, which combination of reactants is commonly used to synthesize amides?
A) an amine and an anhydride B) an amine and an alcohol C) an amine and a carboxylic acid D) None of these, amides cannot be synthesized at room temperature.