How were the maria formed?
A. Maria were formed by ancient oceans on the Moon's surface.
B. Maria formed from ash falls from long dead volcanoes.
C. They were formed by the huge tidal interaction between Earth and Moon.
D. Successive volcanic eruptions flooded huge basins formed by large impacts.
Answer: D
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If Earth had no atmosphere, its temperature would be
A) somewhat warmer than the freezing temperature of water. B) somewhat below the freezing temperature of water. C) extremely hot, about 50 degrees Celsius. D) well below freezing, about -50 degrees Celsius. E) about the same temperature it is now.
The force on a charged particle created by its motion in a magnetic field is maximum at what angle between the particle velocity and field?
a. zero b. 180° c. 90° d. 45°
Dipole-induced dipole forces of attraction exist between water and gasoline, and yet these two substances do not mix because water has such a strong attraction for itself
Which of the following compounds might best help to make these two substances mix into a single liquid phase? A) the molecule on the far left because the O-H bond is polar and the carbon and hydrogen bonds are nonpolar B) the molecule in the middle because when the salts mix into the water, it will help separate the water and decrease the attraction for itself C) The molecule on the right will form attractions with the polar ends of the water, allowing the gasoline a chance to mix with the water. D) All of these molecules would be equally effective at increasing the mixing of gasoline and water.
Why are several observations or trials taken for each measurement?