Why would anyone be interested in mining material from an asteroid?
What will be an ideal response?
The iron-rich asteroids, especially, should contain a high proportion of heavy elements that sank to Earth's core and are therefore very rare on Earth's surface (and consequently expensive).
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Which of the following statements is true?
A. Even though X-rays have higher energy, they move with the same speed as that of visible light. B. X-rays have higher energy, but still they move slower than visible light. C. X-rays have higher energy, hence they move faster than visible light. D. None of these choices are correct.
The Sun's core is generating energy in the form of ________.
A. X-rays B. ultraviolet waves C. visible light D. radio waves E. gamma rays
The ratio of the density of a material to the density of water is the weight density
a. True b. False Indicate whether the statement is true or false
When water is turned on in a shower, the shower curtain moves towards the water spray. This partly involves
A) capillary action. B) surface tension. C) pressure changes in moving fluids. D) none of the above