Why were ancient peoples unable to detect stellar parallax?
A) They did not look for it.
B) They could not see distant stars.
C) They did not have the ability to measure very small angles.
D) They did not observe for long enough periods of time.
E) They did detect it, but they rejected the observations.
C
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Two lightbulbs both operate on 120 V. One has a power of 25 W and the other 100 W. Which lightbulb has higher resistance?
1.The dim 25-W lightbulb does. 2.The bright 100-W lightbulb does. 3.Both are the same.
Which of the following gases was present in the smallest amounts in early atmosphere of the Earth?
A) hydrogen (H2) B) nitrogen (N2) C) carbon dioxide (CO2) D) oxygen (O2)
What are the benefits of living near a volcano?
What will be an ideal response?
Astronomers believe that the Moon did not differentiate to the same degree as Earth because:
A) the Moon was made of solid debris, not liquids like our hydrosphere. B) the meteors that hit the Moon were lighter than those that hit us, so did not generate as much heat on the surface. C) the less dense and smaller Moon did not have as much radioactivity as the larger Earth in its core. D) the Moon was formed after the Earth was, so its radioactivity was less. E) the Moon was made of very different materials than our mantle and crust.