Which of the following is true about irregular galaxies?
A) They were more common when the universe was younger.
B) They have significant spheroidal component.
C) They are composed solely of old stars.
D) They have well defined spiral arms.
E) They have reddish colors.
A
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Large scale structures of the Universe include ___________
a. filaments b. voids c. walls d. All of the other choices are correct.
For which of these scenarios is the wave model of light more convenient to use?
A. refraction of light through a lens B. diffraction of light through a slit C. receiving radio transmissions D. the Doppler shift of light E. All of these choices are correct.
The formula for the hydronium ion is ______________
A. H? B. H?O? C. H?O? D. H?O?
When subsurface ground material is completely saturated with water, we call it
A) the water table. B) groundwater. C) the saturated zone. D) the unsaturated zone.