Describe at least two things that make Earth unique in the solar system?
What will be an ideal response?
Answer: Possible answers: It is the only planet with an oxygen-rich atmosphere and abundant liquid water on its surface. Its surface temperature is such that water can exist in three phases: solid, liquid, and gaseous. Compared to its size, Earth also has a very large moon. It is the only planet with plate tectonics. It is the only planet we know of that harbors life.
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The _______________ is a high temperature, low density region in the interstellar medium around the Sun
Fill in the blank(s) with correct word
If two balls are thrown from the same cliff with the same speed, one up, one down, when they touch the ground, they should:
a. have different speed b. the same speed c. touch the ground in the same time d. travel the same distance in the air e. none of above
Distant bright snowy mountains appear yellowish because
A) they are far away. B) blue has been scattered away from light reflected from the mountains. C) the color yellow looks just right. D) of nature's wonderful preferences.
Which of the following is not a prediction made by the theory of relativity?
A) No material object sent outward from Earth can reach or exceed the speed of light. B) Observers in different reference frames may disagree about whether two events in two different places occur simultaneously. C) Observers in different reference frames may disagree about the time and distance between two events. D) Observers in different reference frames may disagree about the basic laws of nature. E) E = mc2