terrestrial planets denser than jovian planets A Only dense materials could

Terrestrial planets denser than jovian planets a only

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terrestrial planets denser than jovian planets?  A) 
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Only dense  materials could condense in the inner solar nebula.   B) 
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The Sun's  gravity gathered dense materials into the inner solar system.   C) 
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Gravity  compresses terrestrial planets to a higher degree, making them denser.   D) 
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Actually, the  jovian planets are denser than the terrestrial planets.   Answer:  
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A 15) 
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Suppose  you find a  rock that  contains 10 micrograms of radioactive potassium - 40, which has a half - life of 1. 25 billion years. By measuring the amount  of its decay product (argon - 40) present in the rock, you conclude that there must have been 80 micrograms of potassium - 40 when the rock solidified. How old is the rock? 
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1.25 billion  years 
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2.5 billion years 
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3.75 billion  years 
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5.0 billion years 
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C 16) 
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How do  scientists determine the age of the solar system? 
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radiometric  dating of Moon rocks 
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radiometric  dating of the oldest Earth rocks 
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radiometric  dating of meteorites 
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Theoretical  calculations tell us how long it has taken the planets to evolve to their present forms.  
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C 17) 
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The  region of  our solar  system between Mercury and Mars has very few asteroids, while the region between Mars and Jupiter has many asteroids.  Based on what you have learned, what is the most likely explanation for the lack of asteroids between Mercury and Mars? 
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There were very  few planetary  leftovers in this region, because most of the solid material was accreted by the terrestrial planets as the planets  formed.  
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