Which of the following is the phase of matter in the Sun?
A) solid
B) gas
C) plasma
D) liquid
E) a mixture of all of the above
C
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Based on what you have learned from your rankings in Parts A and B which statement best describes how variation in the Earth-Sun distance affects the seasons?
A. No matter where you live or what the seasons, it is generally hotter when Earth is closer to the Sun and colder when Earth is farther from the Sun. B. The variation in Earth-Sun distance over the course of each year has virtually no effect on the seasons. C. Summer occurs when Earth is closer to the Sun and winter occurs when Earth is farther from the Sun
A laser can be used for very accurate measurements of distances between objects
Indicate whether the statement is true or false
Spiral arms are clearly visible features of galaxies because most sun-like stars in the disk are found there
a. True b. False Indicate whether the statement is true or false
A potential changes at the greatest rate in the direction of the gradient of the potential
Indicate whether the statement is true or false